Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Topics - Amianthus

Pages: 1 [2] 3 4 ... 28
16
3DHS / Worst-case thinking makes us nuts, not safe
« on: May 12, 2010, 01:49:45 PM »
By Bruce Schneier, Special to CNN
May 12, 2010 12:06 p.m. EDT

Editor's note: Bruce Schneier is a security technologist, and author of "Beyond Fear: Thinking Sensibly About Security in an Uncertain World." You can read more of his writing at http://www.schneier.com/

(CNN) -- At a security conference recently, the moderator asked the panel of distinguished cybersecurity leaders what their nightmare scenario was. The answers were the predictable array of large-scale attacks: against our communications infrastructure, against the power grid, against the financial system, in combination with a physical attack.

I didn't get to give my answer until the afternoon, which was: "My nightmare scenario is that people keep talking about their nightmare scenarios."

There's a certain blindness that comes from worst-case thinking. An extension of the precautionary principle, it involves imagining the worst possible outcome and then acting as if it were a certainty. It substitutes imagination for thinking, speculation for risk analysis and fear for reason. It fosters powerlessness and vulnerability and magnifies social paralysis. And it makes us more vulnerable to the effects of terrorism.

Worst-case thinking means generally bad decision making for several reasons. First, it's only half of the cost-benefit equation. Every decision has costs and benefits, risks and rewards. By speculating about what can possibly go wrong, and then acting as if that is likely to happen, worst-case thinking focuses only on the extreme but improbable risks and does a poor job at assessing outcomes.

Second, it's based on flawed logic. It begs the question by assuming that a proponent of an action must prove that the nightmare scenario is impossible.

Third, it can be used to support any position or its opposite. If we build a nuclear power plant, it could melt down. If we don't build it, we will run short of power and society will collapse into anarchy. If we allow flights near Iceland's volcanic ash, planes will crash and people will die. If we don't, organs won't arrive in time for transplant operations and people will die. If we don't invade Iraq, Saddam Hussein might use the nuclear weapons he might have. If we do, we might destabilize the Middle East, leading to widespread violence and death.

Of course, not all fears are equal. Those that we tend to exaggerate are more easily justified by worst-case thinking. So terrorism fears trump privacy fears, and almost everything else; technology is hard to understand and therefore scary; nuclear weapons are worse than conventional weapons; our children need to be protected at all costs; and annihilating the planet is bad. Basically, any fear that would make a good movie plot is amenable to worst-case thinking.

Fourth and finally, worst-case thinking validates ignorance. Instead of focusing on what we know, it focuses on what we don't know -- and what we can imagine.

Remember Defense Secretary Donald Rumsfeld's quote? "Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns -- the ones we don't know we don't know." And this: "the absence of evidence is not evidence of absence." Ignorance isn't a cause for doubt; when you can fill that ignorance with imagination, it can be a call to action.

Even worse, it can lead to hasty and dangerous acts. You can't wait for a smoking gun, so you act as if the gun is about to go off. Rather than making us safer, worst-case thinking has the potential to cause dangerous escalation.

The new undercurrent in this is that our society no longer has the ability to calculate probabilities. Risk assessment is devalued. Probabilistic thinking is repudiated in favor of "possibilistic thinking": Since we can't know what's likely to go wrong, let's speculate about what can possibly go wrong.

Worst-case thinking leads to bad decisions, bad systems design, and bad security. And we all have direct experience with its effects: airline security and the TSA, which we make fun of when we're not appalled that they're harassing 93-year-old women or keeping first-graders off airplanes. You can't be too careful!

Actually, you can. You can refuse to fly because of the possibility of plane crashes. You can lock your children in the house because of the possibility of child predators. You can eschew all contact with people because of the possibility of hurt. Steven Hawking wants to avoid trying to communicate with aliens because they might be hostile; does he want to turn off all the planet's television broadcasts because they're radiating into space? It isn't hard to parody worst-case thinking, and at its extreme it's a psychological condition.

Frank Furedi, a sociology professor at the University of Kent, writes: "Worst-case thinking encourages society to adopt fear as one of the dominant principles around which the public, the government and institutions should organize their life. It institutionalizes insecurity and fosters a mood of confusion and powerlessness. Through popularizing the belief that worst cases are normal, it incites people to feel defenseless and vulnerable to a wide range of future threats."

Even worse, it plays directly into the hands of terrorists, creating a population that is easily terrorized -- even by failed terrorist attacks like the Christmas Day underwear bomber and the Times Square SUV bomber.

When someone is proposing a change, the onus should be on them to justify it over the status quo. But worst case thinking is a way of looking at the world that exaggerates the rare and unusual and gives the rare much more credence than it deserves.

It isn't really a principle; it's a cheap trick to justify what you already believe. It lets lazy or biased people make what seem to be cogent arguments without understanding the whole issue. And when people don't need to refute counterarguments, there's no point in listening to them.

The opinions expressed in this commentary are solely those of Bruce Schneier.

http://www.cnn.com/2010/OPINION/05/11/schneier.worst.case.thinking/index.html

17
3DHS / Nearly 50% Will Pay No Fed Income Tax for 2009
« on: April 07, 2010, 06:19:51 PM »
WASHINGTON, April 7, 2010
For Many Americans, Incomes Are Too Low Or They Qualify For Many Credits, Deductions and Excemptions (sic)

(AP)  Tax Day is a dreaded deadline for millions, but for nearly half of U.S. households it's simply somebody else's (sic) problem.

About 47 percent will pay no federal income taxes at all for 2009. Either their incomes were too low, or they qualified for enough credits, deductions and exemptions to eliminate their liability. That's according to projections by the Tax Policy Center, a Washington research organization.

Most people still are required to file returns by the April 15 deadline. The penalty for skipping it is limited to the amount of taxes owed, but it's still almost always better to file: That's the only way to get a refund of all the income taxes withheld by employers.

In recent years, credits for low- and middle-income families have grown so much that a family of four making as much as $50,000 will owe no federal income tax for 2009, as long as there are two children younger than 17, according to a separate analysis by the consulting firm Deloitte Tax.

Tax cuts enacted in the past decade have been generous to wealthy taxpayers, too, making them a target for President Barack Obama and Democrats in Congress. Less noticed were tax cuts for low- and middle-income families, which were expanded when Obama signed the massive economic recovery package last year.

The result is a tax system that exempts almost half the country from paying for programs that benefit everyone, including national defense, public safety, infrastructure and education. It is a system in which the top 10 percent of earners - households making an average of $366,400 in 2006 - paid about 73 percent of the income taxes collected by the federal government.

The bottom 40 percent, on average, make a profit from the federal income tax, meaning they get more money in tax credits than they would otherwise owe in taxes. For those people, the government sends them a payment.

"We have 50 percent of people who are getting something for nothing," said Curtis Dubay, senior tax policy analyst at the Heritage Foundation.

The vast majority of people who escape federal income taxes still pay other taxes, including federal payroll taxes that fund Social Security and Medicare, and excise taxes on gasoline, aviation, alcohol and cigarettes. Many also pay state or local taxes on sales, income and property.

That helps explain the country's aversion to taxes, said Clint Stretch, a tax policy expert Deloitte Tax. He said many people simply look at the difference between their gross pay and their take-home pay and blame the government for the disparity.

"It's not uncommon for people to think that their Social Security taxes, their 401(k) contributions, their share of employer health premiums, all of that stuff in their mind gets lumped into income taxes," Stretch said.

The federal income tax is the government's largest source of revenue, raising more than $900 billion - or a little less than half of all government receipts - in the budget year that ended last Sept. 30. But with deductions and credits, especially for families with children, there have long been people who don't pay it, mainly lower-income families.

The number of households that don't pay federal income taxes increased substantially in 2008, when the poor economy reduced incomes and Congress cut taxes in an attempt to help recovery.

In 2007, about 38 percent of households paid no federal income tax, a figure that jumped to 49 percent in 2008, according to estimates by the Tax Policy Center.

In 2008, President George W. Bush signed a law providing most families with rebate checks of $300 to $1,200. Last year, Obama signed the economic recovery law that expanded some tax credits and created others. Most targeted low- and middle-income families.

Obama's Making Work Pay credit provides as much as $800 to couples and $400 to individuals. The expanded child tax credit provides $1,000 for each child under 17. The Earned Income Tax Credit provides up to $5,657 to low-income families with at least three children.

There are also tax credits for college expenses, buying a new home and upgrading an existing home with energy-efficient doors, windows, furnaces and other appliances. Many of the credits are refundable, meaning if the credits exceed the amount of income taxes owed, the taxpayer gets a payment from the government for the difference.

"All these things are ways the government says, if you do this, we'll reduce your tax bill by some amount," said Roberton Williams, a senior fellow at the Tax Policy Center.

The government could provide the same benefits through spending programs, with the same effect on the federal budget, Williams said. But it sounds better for politicians to say they cut taxes rather than they started a new spending program, he added.

Obama has pushed tax cuts for low- and middle-income families and tax increases for the wealthy, arguing that wealthier taxpayers fared well in the past decade, so it's time to pay up. The nation's wealthiest taxpayers did get big tax breaks under Bush, with the top marginal tax rate reduced from 39.6 percent to 35 percent, and the second-highest rate reduced from 36 percent to 33 percent.

But income tax rates were lowered at every income level. The changes made it relatively easy for families of four making $50,000 to eliminate their income tax liability.

Here's how they did it, according to Deloitte Tax:

The family was entitled to a standard deduction of $11,400 and four personal exemptions of $3,650 apiece, leaving a taxable income of $24,000. The federal income tax on $24,000 is $2,769.

With two children younger than 17, the family qualified for two $1,000 child tax credits. Its Making Work Pay credit was $800 because the parents were married filing jointly.

The $2,800 in credits exceeds the $2,769 in taxes, so the family makes a $31 profit from the federal income tax. That ought to take the sting out of April 15.

Original Article

18
3DHS / James Lovelock: Humans are too stupid to prevent climate change
« on: April 01, 2010, 04:52:17 PM »
In his first in-depth interview since the theft of UEA emails, the scientist blames inertia and democracy for lack of action

Humans are too stupid to prevent climate change from radically impacting on our lives over the coming decades. This is the stark conclusion of James Lovelock, the globally respected environmental thinker and independent scientist who developed the Gaia theory.

It follows a tumultuous few months in which public opinion on efforts to tackle climate change has been undermined by events such as the climate scientists' emails leaked from the University of East Anglia (UEA) and the failure of the Copenhagen climate summit.

"I don't think we're yet evolved to the point where we're clever enough to handle a complex a situation as climate change," said Lovelock in his first in-depth interview since the theft of the UEA emails last November. "The inertia of humans is so huge that you can't really do anything meaningful."

One of the main obstructions to meaningful action is "modern democracy", he added. "Even the best democracies agree that when a major war approaches, democracy must be put on hold for the time being. I have a feeling that climate change may be an issue as severe as a war. It may be necessary to put democracy on hold for a while."

Lovelock, 90, believes the world's best hope is to invest in adaptation measures, such as building sea defences around the cities that are most vulnerable to sea-level rises. He thinks only a catastrophic event would now persuade humanity to take the threat of climate change seriously enough, such as the collapse of a giant glacier in Antarctica, such as the Pine Island glacier, which would immediately push up sea level.

"That would be the sort of event that would change public opinion," he said. "Or a return of the dust bowl in the mid-west. Another Intergovernmental Panel on Climate Change (IPCC) report won't be enough. We'll just argue over it like now." The IPCC's 2007 report concluded that there was a 90% chance that greenhouse gas emissions from human activities are causing global warming, but the panel has been criticised over a mistaken claim that all Himalayan glaciers could melt by 2030.

Lovelock says the events of the recent months have seen him warming to the efforts of the "good" climate sceptics: "What I like about sceptics is that in good science you need critics that make you think: 'Crumbs, have I made a mistake here?' If you don't have that continuously, you really are up the creek. The good sceptics have done a good service, but some of the mad ones I think have not done anyone any favours. You need sceptics, especially when the science gets very big and monolithic."

Lovelock, who 40 years ago originated the idea that the planet is a giant, self-regulating organism ? the so-called Gaia theory ? added that he has little sympathy for the climate scientists caught up in the UEA email scandal. He said he had not read the original emails ? "I felt reluctant to pry" ? but that their reported content had left him feeling "utterly disgusted".

"Fudging the data in any way whatsoever is quite literally a sin against the holy ghost of science," he said. "I'm not religious, but I put it that way because I feel so strongly. It's the one thing you do not ever do. You've got to have standards."

Original Article

19
3DHS / 'Supertaskers' can safely use mobiles while driving
« on: April 01, 2010, 04:48:50 PM »
A small minority of individuals show no loss of reaction time or mental skills when combining mobile phone use and motorway driving.

By Martin James, 30 Mar 2010 at 12:01

A University of Utah study into the effects of mobile phone use on people's driving skills has come to the expected conclusion that using a phone while driving can be highly dangerous.

Or at least that's the case for most of us. The study also made the entirely unexpected discovery that for one in 40 of us, there were no signs of impairment whatsoever.

University psychologists Jason Watson and David Strayer tested 200 subjects in two motorway driving simulation tests, one of which also involved having a hands-free mobile phone conversation that required them to memorise words and solve maths equations.

For the vast majority of the test subjects, the researchers recorded an average 20 per cent increase in braking response time, a 30 per cent increase in following distance, an 11 per cent drop in memory performance and a three per cent drop in the ability to do maths problems.

However, the five 'supertaskers' not only showed no appreciable difference in following distance, braking time and maths ability, but remarkably they actually displayed a three per cent improvement to memory performance.

?According to cognitive theory, these individuals ought not to exist,? Watson says in a statement. ?Yet, clearly they do, so we use the 'supertasker' term as a convenient way to describe their exceptional multitasking ability.?

However, with the study likely to be taken as justification for self-proclaimed 'supertaskers' to continue to take risks by using their mobiles while driving, Watson had a word of caution.

?Given the number of individuals who routinely talk on the phone while driving, one would have hoped that there would be a greater percentage of supertaskers,? he commented.

The findings will be published later this year in the Psychonomic Bulletin and Review.

In the UK, the penalities issued to those who risk their own lives and the lives of others by using a mobile at the wheel have been toughened.

Original Article

20
3DHS / NASA tapped to help Toyota acceleration investigation
« on: April 01, 2010, 04:46:42 PM »
By Layer 8
Created Mar 30 2010 - 1:26pm

If you want to solve a major engineering mystery why not bring in some of the world's best engineers?

The US Department of Transportation's National Highway Traffic Safety Administration today said it was doing just by bringing in NASA engineers with expertise in areas such as computer controlled electronic systems, electromagnetic interference and software integrity to help tackle the issue of unintended vehicle acceleration in Toyotas.  The NHTSA review of the electronic throttle control systems in Toyotas is to be completed by late summer.

The DOT said engineers from the National Academy of Sciences - an independent body of scientific experts - will also look into the overarching subject of unintended acceleration and electronic vehicle controls across the entire automotive industry.

For NASA, the space agency's engineers will focus on technology such as electromagnetic compatibility as part of a shorter-term review of the systems used in Toyota vehicles to determine whether they contain any possible flaws that would warrant a defect investigation, the DOT stated.

NASA's expertise in electronics, hardware, software, hazard analysis and complex problem solving ensures this review will be comprehensive.  Currently there are nine experts from NASA assisting NHTSA, and additional personnel will join the team if needed, the DOT stated.

"We are determined to get to the bottom of unintended acceleration," said U.S. Transportation Secretary Ray LaHood in a statement.  "For the safety of the American driving public, we must do everything possible to understand what is happening. And that is why we are tapping the best minds around."

It's not unusual for NASA to get involved in such investigations.  Previous technology examinations involved electronic stability control and airbags.

In 2003, NASA and the NHTSA wanted to research new methods for testing vehicle rollover resistance after a widely reported factory recall of Firestone tires. NASA's High Capacity Centrifuge (HCC) was the answer. Vehicles were spun, using the HCC at NASA's Goddard Space Flight Center on a test platform, until inertia and centrifugal force caused them to tip.  Results of that test have set standards for rollover technology development.

Meanwhile the scientists from the National Academy of Sciences will review industry and government efforts to identify possible sources of unintended acceleration, including electronic vehicle controls, human error, mechanical failure and interference with accelerator systems. 

The experts will look at software, computer hardware design, electromagnetic compatibility and electromagnetic interference.  The panel will make recommendations to NHTSA on how its rulemaking, research and defect investigation activities may help ensure the safety of electronic control systems in motor vehicles, the DOT stated.

Both studies - from the National Academy of Sciences and from NHTSA/NASA - will be reviewed by scientific experts. The total cost of the two studies is expected to come to approximately $3 million, including the cost of purchasing cars that have allegedly experienced unintended acceleration to be studied. 

Follow Michael Cooney on Twitter: nwwlayer8

Original Article

21
3DHS / The First Test That Proves General Theory of Relativity Wrong
« on: March 05, 2010, 12:36:02 PM »
A spinning top increases its weight much more than expected

By Vlad Tarko, Senior Editor, Sci-Tech News

March 24th, 2006, 12:39 GMT



According to Einstein's theory of general relativity, a moving mass should create another field, called gravitomagnetic field, besides its static gravitational field. This field has now been measured for the first time and to the scientists' astonishment, it proved to be no less than one hundred million trillion times larger than Einstein's General Relativity predicts.

This gravitomagnetic field is similar to the magnetic field produced by a moving electric charge (hence the name "gravitomagnetic" analogous to "electromagnetic"). For example, the electric charges moving in a coil produce a magnetic field - such a coil behaves like a magnet. Similarly, the gravitomagnetic field can be produced to be a mass moving in a circle. What the electric charge is for electromagnetism, mass is for gravitation theory (the general theory of relativity).

A spinning top weights (sic) more than the same top standing still. However, according to Einstein's theory, the difference is negligible. It should be so small that we shouldn't even be capable of measuring it. But now scientists from the European Space Agancy, Martin Tajmar, Clovis de Matos and their colleagues, have actually measured it. At first they couldn't believe the result.

"We ran more than 250 experiments, improved the facility over 3 years and discussed the validity of the results for 8 months before making this announcement. Now we are confident about the measurement," says Tajmar. They hope other physicists will now conduct their own versions of the experiment so they could be absolutely certain that they have really measured the gravitomagnetic field and not something else. This may be the first empiric clue for how to merge together quantum mechanics and general theory of relativity in a single unified theory.

"If confirmed, this would be a major breakthrough," says Tajmar, "it opens up a new means of investigating general relativity and its consequences in the quantum world."

The experiment involved a ring of superconducting material rotating up to 6 500 times a minute. According to quantum theory, spinning superconductors should produce a weak magnetic field. The problem was that Tajmar and de Matos experiments with spinning superconductors didn't seem to fit the theory - although in all other aspects the quantum theory gives incredibly accurate predictions. Tajmar and de Matos then had the idea that maybe the quantum theory wasn't wrong after all but that there was some additional effect overlapping over their experiments, some effect they neglected.

What could this other effect be? They thought maybe it's the gravitomagnetic field - the fact that the spinning top exerts a higher gravitational force. So, they placed around the spinning superconductor a series of very sensible acceleration sensors for measuring whether this effect really existed. They obtained more than they bargained for!

Although the acceleration produced by the spinning superconductor was 100 millionths of the acceleration due to the Earth's gravitational field, it is a surprising one hundred million trillion times larger than Einstein's General Relativity predicts. Thus, the spinning top generated a much more powerful gravitomagnetic field than expected.

Now, it remains the need for a proper theory. Scientists can also now check whether candidate theories, such as the string theory, can describe this experiment correctly. Moreover, this experiment shows that gravitational waves should be much more easily to detect than previously thought.



Original Article

22
3DHS / On Learning
« on: February 24, 2010, 03:05:59 PM »
The following is an excerpt from Richard Feynman's book "Surely You're Joking, Mr. Feynman" (p. 211-219, W. W. Norton & Co., 1997). Feynman is a winner of the Nobel Prize in physics. Here he recounts his experiences while teaching in Brazil.

In regard to education in Brazil, I had a very interesting experience. I was teaching a group of students who would ultimately become teachers, since at that time there were not many opportunities in Brazil for a highly trained person in science. These students had already had many courses, and this was to be their most advanced course in electricity and magnetism - Maxwell's equations, and so on.

The university was located in various office buildings throughout the city, and the course I taught met in a building which overlooked the bay.

I discovered a very strange phenomenon: I could ask a question, which the students would answer immediately. But the next time I would ask the question - the same subject, and the same question, as far as I could tell - they couldn't answer it at all! for instance, one time I was talking about polarized light, and I gave them all some strips of polaroid.

Polaroid passes only light whose electric vector is in a certain direction, so I explained how you could tell which way the light is polarized from whether the polaroid is dark or light.

We first took two strips of polaroid and rotated them until they let the most light through. From doing that we could tell that the two strips were now admitting light polarized in the same direction - what passed through one piece of polaroid could also pass through the other. But then I asked then how one could tell the absolute direction of polarization, from a single piece of polaroid.

They hadn't any idea.

I knew this took a certain amount of ingenuity, so I gave them a hint: "Look at the light reflected from the bay outside."

Nobody said anything.

Then I said, "Have you ever heard of Brewster's Angle?"

"Yes, sir! Brewster's Angle is the angle at which light is reflected from a medium with an index of refraction is completely polarized."

"And which way is the light polarized when it's reflected?"

"The light is polarized perpendicular to the plane of reflection, sir." Even now, I have to think about it; they knew it cold! They even knew the tangent of the angle equals the index!

I said, "Well?"

Still nothing. They had just told me that light reflected from a medium with an index, such as the bay outside, was polarized; they had even told me which way it was polarized.

I said, "Look at the bay outside, through the polaroid. Now turn the polaroid."

"Ooh, it's polarized!" they said.

After a lot of investigation, I finally figured out that the students had memorized everything, but they didn't know what anything meant. When they heard "light that is reflected from a medium with an index," they didn't know that it meant a material such as water. They didn't know that the "direction of the light" is the direction in which you see something when you're looking at it, and so on. Everything was entirely memorized, yet nothing had been translated into meaningful words. So if I asked, "What is Brewster's Angle?" I'm going into the computer with the right keywords. But if I say, "Look at the water," nothing happens - they don't have anything under "Look at the water!"

Later I attended a lecture at the engineering school. The lecture went like this, translated into English: "Two bodies . . . are considered equivalent . . . if if equal torques . . . will produce . . . equal acceleration. Two bodies, are considered equivalent, if equal torques, will produce equal acceleration." The students were all sitting there taking dictation, and when the professor repeated the sentence, they checked it to make sure they wrote it down all right. Then they wrote down the next sentence, and on and on. I was the only one who knew the professor was talking about objects with the same moment of inertia, and it was hard to figure out.

I didn't see how they were going to learn anything from that. Here he was talking about moments of inertia, but there was no discussion about how hard it is to push a door open when you put heavy weights on the outside, compared to when you put them near the hinge - nothing!

After the lecture, I talked to a student: "You take all those notes - what do you do with them?"

"Oh, we study them," he says. "We'll have an exam."

"What will the exam be like?"

"Very easy. I can tell you now one of the questions." He looks at his notebook and says, "'When are two bodies equivalent?' And the answer is, 'Two bodies are considered equivalent if equal torques will produce equal acceleration.'" So, you see, they could pass the examinations, and "learn" all this stuff, and not know anything at all, except what they had memorized.

Then I went to an entrance exam for students coming into the engineering school. It was an oral exam, and I was allowed to listen to it. One of the students was absolutely super: He answered everything nifty! The examiners asked him what diamagnetism was, and he answered it perfectly. Then they asked, "When light comes at an angle through a sheet of material with a certain thickness, and a certain index N, what happens to the light?"

"It comes out parallel to itself, sir - displaced."

"And how much is it displaced?"

"I don't know, sir, but I can figure it out." So he figured it out. He was very good. But I had, by this time, my suspicions.

After the exam I went up to this bright young man, and explained to him that I was from the United States, and that I wanted to ask him some questions that would not affect the result of his examination in any way. The first question I ask is, "Can you give me some example of a diamagnetic substance?"

"No."

Then I asked, "If this book was made of glass, and I was looking at something on the table through it, what would happen to the image if I tilted the glass?"

"It would be deflected, sir, by twice the angle that you've turned the book."

I said, "You haven't got it mixed up with a mirror, have you?"

"No, sir!"

He had just told me in the examination that the light would be displaced, parallel to itself, and therefore the image would move over to one side, but he didn't realize that a piece of glass is a material with an index, and that his calculation had applied to my question.

I taught a course at the engineering school on mathematical methods in physics, in which I tried to show how to solve problems by trial and error. It's something that people don't usually learn, so I began with some simple examples of arithmetic to illustrate the method. I was surprised that only about eight out of the eighty or so students turned in the first assignment. So I gave a strong lecture about having to actually try it, not just sit back and watch me do it.

After the lecture some students came up to me in a little delegation, and told me that I didn't understand the backgrounds that they have, that they can study without doing the problems, that they have already learned arithmetic, and that this stuff was beneath them.

So I kept going with the class, and no matter how complicated or obviously advanced the work was becoming, they were never handing a damn thing in. Of course I realized what it was: They couldn't do it!

One other thing I could never get them to do was to ask questions. Finally, a student explained it to me: "If I ask you a question during the lecture, afterwards everybody will be telling me, 'What are you wasting our time for in the class? We're trying to learn something. And you're stopping him by asking a question.'"

It was kind of a one-upmanship, where nobody knows what's going on, and they'd put the other on down as if they did know. They all fake that they know, and if one student admits for a moment that something is confusing by asking a question, the others take a high-handed attitude, acting as if it's not confusing at all, telling him that he's wasting their time.

I explained how useful it was to work together, to discuss the questions, to talk it over, but they wouldn't do that either, because they would be losing face if they had to ask someone else. It was pitiful! All the work they did, intelligent people, but they got themselves into this funny state of mind, this strange kind of self-propagating "education" which is meaningless, utterly meaningless!

At the end of the academic year, the students asked me to give a talk about my experiences of teaching in Brazil. At the talk there would be not only students, but professors and government officials, so I made them promise that I could say whatever I wanted. They said, "Sure. Of course. It's a free country."

So I came in, carrying the elementary physics textbook that they used in the first year of college. They thought this book was especially good because it had different kinds of typeface - bold black for the most important things to remember, lighter for less important things, and so on.

Right away somebody said, "You're not going to say anything bad about the textbook, are you? The man who wrote it is here, and everybody thinks it's a good textbook."

"You promised I could say whatever I wanted."

The lecture hall was full. I started out by defining science as an understanding of the behavior of nature. Then I asked, "What is a good reason for teaching science? Of course, no country can consider itself civilized unless . . . yak, yak, yak." They were all sitting there nodding, because I know that's the way the think.

Then I say, "That, of course, is absurd, because why should we feel we have to keep up with another country? We have to do it for a good reason, a sensible reason; not just because other countries do." Then I talked about the utility of science, and its contribution to the improvement of the human condition, and all that - I really teased them a little bit.

Then I say, "The main purpose of my talk is to demonstrate to you that no science is being taught in Brazil!"

I can see them stir, thinking, "What? No science? This is absolutely crazy! We have all these classes."

So I tell them that one of the first things to strike me when I came to Brazil was to see elementary school kids in bookstores, buying physics books. There are so many kids learning physics in Brazil, beginning much earlier than kids do in the United States, that it's amazing you don't find many physicists in Brazil - why it that? So many kids are working so hard, and nothing comes of it.

Then I gave the analogy of a Greek scholar who loves the Greek language, who knows that in his own country there aren't many children studying Greek. But he comes to another country, where he is delighted to find everybody studying Greek - even the smaller kids in the elementary schools. He goes to the examination of a student who is coming to get his degree in Greek, and asks him, "What were Socrates' ideas on the relationship between Truth and Beauty?" - and the student can't answer. Then he asks the student, "What did Socrates say to Plato in the Third Symposium?" the student lights up and goes, "Brrrrrrrrr-up" - he tells you everything, word for word, that Socrates said, in beautiful Greek.

But what Socrates was talking about in the Third Symposium was the relationship between Truth and Beauty!

What this Greek scholar discovers is, the students in another country learn Greek by first learning to pronounce the letters, then the words, and then the sentences and paragraphs. They can recite, word for word, what Socrates said, without realizing that those Greek words actually mean something. To the student they are all artificial sounds. Nobody has ever translated them into words the students can understand.

I said, "That's how it looks to me, when I see you teaching the kids 'science' here in Brazil." (Big blast, right?)

Then I held up the elementary physics textbook they were using. "There are no experimental results mentioned anywhere in this book, except in one place, where there is a ball, rolling down an inclined plane, in which it says how far the ball got after one second, two seconds, three seconds, and so on. The numbers have 'errors' in them - that is, if you look at them, you think you're looking at experimental results, because the numbers are a little above, or a little below, the theoretical values. The book even talks about having to correct the experimental errors - very fine. The trouble is, when you calculate the value of the acceleration constant from these values, you get the right answer. But a ball rolling down an inclined plane, if it is actually done, has an inertia to get it to turn, and will, if you do the experiment, produce five-sevenths of the right answer, because of the extra energy needed to go into the rotation of the ball. Therefore this single example of experimental 'results' is obtained from a fake experiment. Nobody had rolled such a ball, or they would never have gotten those results!

"I have discovered something else," I continued. "By flipping the pages at random, and putting my finger in and reading the sentences on that page, I can show you what's the matter - how it's not science, but memorizing, in every circumstance. Therefore I am brave enough to flip through the pages now, in front of this audience, to put my finger in, to read, and to show you."

So I did it. Brrrrrrrup - I stuck my finger in, and I started to read: "Triboluminescence. Triboluminescence is the light emitted when crystals are crushed . . ."

I said, "And right there, have you got science? No! You have only told what a word means in terms of other words. You haven't told anything about nature - what crystals produce light when you crush them, why they produce light. Did you see any student go home and try it? He can't.

"But if, instead, you were to write, 'When you take a lump of sugar and crush it with a pair of pliers in the dark, you can see a bluish flash. Some other crystals do that too. Nobody knows why. The phenomenon is called "triboluminescence."' Then someone will go home and try it. Then there's an experience of nature." I used that example to show them, but it didn't make any difference where I would have put my finger in the book; it was like that everywhere.

Finally, I said that I couldn't see how anyone could be educated by this self-propagating system in which people pass exams, and teach others to pass exams, but nobody knows anything. "However," I said, "I must be wrong. There were two students in my class who did very well, and one of the physicists I know was educated entirely in Brazil. Thus, it must be possible for some people to work their way through the system, bad as it is."

Well, after I gave the talk, the head of the science education department got up and said, "Mr. Feynman has told us some things that are very hard for us to hear, but it appears to be that he really loves science, and is sincere in his criticism. Therefore, I think we should listen to him. I came here knowing we have some sickness in our system of education; what I have learned is that we have a cancer!" - and he sat down.

That gave the other people the freedom to speak out, and there was a big excitement. Everybody was getting up and making suggestions. The students got some committee together to mimeograph the lectures in advance, and they got other committees organized to do this and that.

Then something happened which was totally unexpected for me. One of the students got up and said, "I'm one of the two students whom Mr. Feynman referred to at the end of his talk. I was not educated in Brazil; I was educated in Germany, and I've just come to Brazil this year."

The other student who had done well in class had a similar thing to say. And the professor I had mentioned got up and said, "I was educated here in Brazil during the war, when, fortunately, all of the professors had left the university, so I learned everything by reading alone. Therefore I was not really educated under the Brazilian system."

I didn't expect that - I knew the system was bad, but 100 percent - it was terrible!

Since I had gone to Brazil under a program sponsored by the United States Government, I was asked by the State Department to write a report about my experiences in Brazil, so I wrote out the essentials of the speech I had just given. I found out later through the grapevine that the reaction of somebody in the State Department was, "That shows you how dangerous it is to send somebody to Brazil who is so naive. Foolish fellow; he can only cause trouble. He didn't understand the problems." Quite the contrary! I think this person in the State Department was naive to think that because he saw a university with a list of courses and descriptions, that's what it was.

Original Article

23
3DHS / Suit: Pa. school spied on students via laptops
« on: February 18, 2010, 03:43:28 PM »
By MARYCLAIRE DALE, Associated Press Writer Maryclaire Dale, Associated Press Writer - 1 hr 40 mins ago

PHILADELPHIA - A federal lawsuit accuses a suburban Philadelphia school district of spying on students at home through school-issued laptop webcams.

The suit says Lower Merion School District officials can activate the webcams remotely without students' knowledge. The lawsuit alleges the cameras captured images of Harriton High School students and their families as they undressed and in other compromising situations.

Families learned of the alleged webcam images when an assistant principal spoke to a student about inappropriate behavior at home.

Superintendent Christopher W. McGinley did not immediately return a message left by The Associated Press.

Original Article

24
3DHS / Former Texas Rep. Charlie Wilson Dies at 76
« on: February 10, 2010, 04:41:08 PM »
Ex-Texas Rep. Charlie Wilson, who helped armed Afghans during war against Soviets, dies at 76



LUFKIN, Texas February 10, 2010 (AP)

A hospital spokeswoman says former Rep. Charlie Wilson of Texas has died at the age of 76.

The spokeswoman says Wilson died Wednesday of cardiopulmonary arrest.

Wilson represented Texas' 2nd District in the House from 1973 to 1996 and was nicknamed "Good Time Charlie" for his partying ways.

He was portrayed in the 2007 movie "Charlie Wilson's War," which chronicled Wilson's efforts to arm Afghani mujahedeen, then called "freedom fighters," during Afghanistan's war against the Soviet Union in 1980s.

Actor Tom Hanks portrayed Wilson in the movie.

Original Article

25
3DHS / Travelling
« on: January 17, 2010, 01:08:00 AM »
I'll be in the Orlando area and the Vero Beach area between 1/23 and 1/30 if anyone wants to get together.

26
3DHS / EGG Energy: The Netflix of Batteries for the Developing World
« on: January 12, 2010, 05:09:50 PM »
By Katie Fehrenbacher



The team behind EGG-energy has a statistic they cite often: In Tanzania 80 percent of the population lives within 5 kilometers of a transmission line but only 10 percent has access to electricity. To help solve that "last mile" problem, the team, which hails from MIT and Harvard, decided to create a business model that closes that gap, not by building out electrical distribution lines, but by "using feet, motorbikes and buses," or a bottom-up grid explained EGG-energy CEO Jamie Yang in an interview with us. The result is a subscription-based battery service - a Netflix of batteries - where customers can pick up a fully-charged battery on the way to work or while shopping for groceries, and a few days later swap out the empty battery for another charged one.

The idea is not unlike the battery swapping concept that electric vehicle infrastructure startup Better Place has been working to build in various countries, and the EGG-energy team told me that they did think about Better Place's business model in the planning stages. But while Better Place looks to couple its batteries with electric vehicles, EGG-energy's customers are using the lead-acid batteries to power much more basic devices: lights, radios and cell phone chargers.

Here's how it works: EGG-energy signs up a customer that is willing to pay $27 for the first year's subscription service, and 40 cents per swap of a depleted battery for a charged one. EGG-energy outfits the customer's home with wiring for lights, cell phones and radios, and the customer can immediately get the first fully-charged battery.

The company has built its first distribution center in rural Tanzania and placed the location close to local bus and commuting routes. The batteries are much smaller than a car battery, making them relatively easy to transport to and from the distribution center. Customers are used to carrying food and water over the same routes, so adding on a battery isn't too much of a stretch, explained Yang.

The most surprising benefit (to me) was that the EGG-energy system can save its customers money on energy costs. The company explains in its executive summary that its target customer spends $5 per month on kerosene and $3 per month on AA batteries, with an average total of $96 per year for lighting and the use of a radio. But with eight swaps per month, the annual cost of the service in total is $65. "Switching to EGG-energy therefore saves a typical household $30.60 a year on its lighting and radio needs," says the company.

The financial savings might be what initially attracts the customer, but the other benefits are more game-changing. The kerosene lamps that many households in the developing world burn at night - to study, cook, socialize, read - are both dirty and dangerous, and EGG-energy-powered lighting in homes can reduce carbon emissions. The defacto connection to the electric grid also gives households more reliable connections to communications like cell phones and radios.

So far EGG-energy has built its first distribution center in November 2009, signed up its first 60 customers and completed feasibility studies that have proven the business model and demand on a small scale. But Yang, who is based in Tanzania, says that 2010 is a huge year for the startup, as it looks to expand rapidly, and test the model in more urban environments.

Success, and beating competition who could easily copy the business model, "relies on rapid expansion," explained board member Alla Jezmir. Some ways that the company is looking to scale include: working with local entrepreneurs to franchise the distribution centers, working with local NGOs on promotion and resources, and even working with larger corporations like telcos in the area that would have an incentive to see more stable cell phone use.

It's an intriguing idea, though one that faces a lot of hurdles. Yang says the biggest difficulty has been figuring out how to do businesses in the developing world as an outsider - learning who to partner with and who carries influence in the village. And Jezmir is right, the plan could be easily replicated, particularly by a really well-funded firm willing to invest and move fast.

Which brings us to the other piece that EGG-energy is looking to achieve this year: more funding. The company has won several business competitions (I learned about them through the Ignite Clean Energy competition) that has provided them some funds, as well as financing from an angel investor. But EGG-energy is looking for hundreds of thousands of dollars more for growth in 2010 and 2011.

Ultimately, Yang says, EGG-energy is looking to help bring better access to electricity and clean power to the developing world, and the battery subscription service is just currently the best way. Follow the company's progress, and find fascinating reports and articles on their Facebook page.

Image courtesy of EGG-energy.

Original Article

27
3DHS / The Truth on Government Spin
« on: January 10, 2010, 06:26:10 PM »
Jan. 3, 2010
Bob Schieffer Says Press Conferences and Statements Aimed at Deflecting Criticism Do Nothing to Inspire Trust

By Bob Schieffer

Homeland Security chief Janet Napolitano is getting hammered because her first response to the "Undie-bomber" fiasco was that "the system worked."

We shouldn't have been surprised. Sure, she looks a little silly now that the facts are dribbling out. But she was just following the modern bipartisan, public relations template in this age of information management.

First, play down the problem. Second, emphasize what did not go wrong, assure us that those in charge are "investigating," and most important; emphasize no one in any position of responsibility is at fault.

It's not lying, but it's not exactly the whole truth - certainly not the whole story. All she left out was that part about asking us to respect the privacy of those involved.

[Oh, I'm sorry. I got the government spin mixed up with the Tiger spin.]

Here is the difference: Tiger can hire as many people as he wants to make his excuses. It may do him no good, but it's his money to spend as he wishes.

When government officials insult us with spin, they are doing it on our dime, which is supposed to be used to operate the government, not to hold news conferences to tell us what a fine job people on the public payroll are doing.

As we learned during Katrina, self-serving spin at the first sign of crisis does not help the situation; it makes it worse, because it makes it harder to believe anything the government says.

Real security is built on trust in the government. That requires truth, which should be the beginning of government presentations, not the fallback position.

Original Article

28
3DHS / Hey BSB
« on: December 29, 2009, 05:51:12 PM »
Was looking around for apps for my 'droid phone, ran across this one. Thought you'd be interested:

http://www.androlib.com/android.application.com-spotlightsix-zentimer-jqwC.aspx

29
3DHS / Guess we've time-shifted to last year...
« on: December 23, 2009, 03:37:52 PM »
Or are you going to continue loading backups, BT?

30
Culture Vultures / Leverage
« on: December 10, 2008, 06:52:11 PM »
I just watched the second episode. I think this show has much promise.

Here are links to torrents of the current episodes:

http://thepiratebay.org/torrent/4562332/Leverage.S01E01.HDTV.XviD-DOT.avi

http://thepiratebay.org/torrent/4566645/Leverage.S01E02.The.Homecoming.Job.HDTV.XviD-FQM.avi

Love the line from the first episode: "She's 20 pounds of crazy in a 5 pound bag."

Pages: 1 [2] 3 4 ... 28