Posts Tagged ‘TED’

Let’s Read the Internet! Week 2

October 19, 2008

Davisson-Germer Experiment Chad Orzel at Uncertain Principles
The first observation of the wave properties of electrons came by accident. Just like you.

A Beautiful New Theory of Everything Garrett Lisi on TED.com
In case you were wondering how everything works…

Didn’t quite catch that? Don’t worry. You can always read the paper.

Infinity is NOT a Number Mark Chu-Carroll at Good Math, Bad Math
More comprehensible than the previous post, if less profound. The fundamental problem with making infinity a number seems to be that it lets you prove all manner of foolishness, such as 1=2.

The Universal Declaration of Human Rights

It’s awfully pretentious to claim your document to be “universal”. Who has the authority? Further, what does it mean for everyone to be equal in rights? Clearly, we are not equal in many senses. Separating out “these things are rights” and “these things are what you have to deal with because of the circumstances of your life” is a tough task. For example, according to this declaration, everyone has a right to marry. But marriage is simply not a universal concept among humans. It’s perfectly conceivable to have viable, righteous societies with absolutely no concept of marriage. The concepts of privacy and property ownership could be sacrificed in righteous societies, under the right circumstances. Creating a list of rights that’s simultaneously universal and specific seems nearly impossible. But the visualization is nice.

Dead Waters Romain Vasseur et. al
Boats that get stuck in plain water. I don’t understand why this works, but the video is really cool.

Chimpanzees Make Spears to Hunt Bushbabies Not Exactly Rocket Science
Like it says, chimps make weapons and kill shit with them. In case you were wondering where we get it from.

Late Bloomers Malcolm Gladwell in The New Yorker
Just because you’re old doesn’t mean you’re useless. Therefore, you might as well slack off for another year or two before beginning that “great life’s work” stuff.

Where’s the Algebra? Michael Alison Chandler on X = Why?
Some chick with a seriously ugly smile asks whether algebra is important. But her “education” from her brother sadly misses the point. She asks, “what good are equations?”, and he replies “We have to learn equations to install lights.” But the entire article is written with the attitude that these equations are magical things that pop out of nowhere to describe lighting systems, their goal being to confuse blue-collar workers to the greatest extent possible. I don’t think there’s any understanding here the equations actually come from somewhere. Someone used a more basic set of principles to derive the equations, or else conducted experiments and then found equations to describe the results. Applying equations to describe real situations is not supposed to be a matter of plugging numbers into formulas.

The Cartoon-Off Farley Katz at The Cartoon Lounge
Normally, I wouldn’t bother linking to something that’s already been Slashdotted, but I bookmarked this page for “Let’s Read the Internet on Wednesday, and then the Slashdot post comes up just hours before I compile my links for the week. I guess the fact that the entire geek culture already knows about doesn’t really impact how funny it is.

The Sun
The web page that makes you go blind if you stare directly at it.

Fabry, Perot, and Their Wonderful Interferometer Skulls In The Stars
The author consistently produces wonderful posts explaining concepts in optics from a historical point of view. I actually used a Fabry-Perot interferometer in physics lab once. What I learned there is that they make surprisingly bad hammers.

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Let’s Read The Internet! Week 1

October 12, 2008

Earth From Above

Sensory overload.  Thirty photographs of socially-relevant scenes from around the world, each of which could easily launch me on a few hours of reading and comparing.  Taken together, they present an overwhelming mosaic of a vibrant, living, interconnected, diverse, and changing planet.

But, damn, I just noticed that the story has gone from displaying 30 photographs to just ten, and the impact is nowhere near as great.  It seems hypocritical that the coordinator of the exhibit (not the artist) should ask the website to take photographs down, when the whole point of the exhibit, as expressed by the artist, is that it be completely free and displayed out on the streets in cities across the world to reach as broad and diverse an audience as possible.

Not the end of evolution again!

  John Wilkins at “Evolving Thoughts”

You might have heard about some guy telling the media that human evolution is over because we now care for our sick.  Wilkins presents a brief, irate counterargument.

I’ve done some reading on evolution from time to time.  What I’ve learned is that’s it’s deceptively difficult to understand.  Although the basic idea that heritable variation and selection pressure combined lead to evolution is straightforward, there are an awful lot of intricacies you find when you begin to look more closely.

There are some things you can do – such as study genomes to see how closely-related two species are, or study fossil records to document the evolutionary history of a species.  But there are a lot of things you can’t do, such as say, “Dinosaurs evolved to be really big because they were in an arms race.  Prey got bigger, so predators were forced to get bigger, and then prey got bigger again and off they went.”  That is not a falsifiable hypothesis, because you can’t go back and test it.

You can study evolution mathematically, and you can make falsifiable predictions, and then compare those predictions to observation.  But statements like, “human evolution is over because we care for our sick” are basically pseudoscience.

Extremely simplistic thinking about evolution leads to paradoxes.  For example, now that we first-world men don’t have to worry much about dying in our mothers’ arms during infancy, getting killed in battle at age 16, or starving to death when the buffalo find a new migration route at age 27, shouldn’t the biggest factor left in our reproductive success be how good we are at attracting women?  And therefore, shouldn’t every man spend all his effort spreading his seed far and wide?  Shouldn’t guys just be thinking about sex all the time…  Oh, never mind.

How We Evolve

Benjamin Phelan at Seed Magazine

A lengthy article about the sort of thing I referenced above – collecting data from genomes to study evolution.  Here, the scientists took genomes from humans of varying ethnic background and looked for characteristic differences in their DNA as evidence of evolution.  Bottom line: Yes, people are still evolving.  For example, as a white man, I am a highly-evolved lactase-producing being, unlike the those primitve, dairy-bloated Asians.

In Defense of Difference

Maywa Montenegro and Terry Glavin at Seed Magazine

In a companion article to the one above, the authors discuss why we might want to save the rainforest, anyway (because we like rain?).  Not just because we like toucans or want to display a World Wildlife Fund bumper sticker on our Prius.  Because it has economic, social, medical, and scientific value to humans.

The idea is that biology is a huge information-gathering system.  From a protein to an organism to an ecosystem, evolution allows biology to record information about how to live in the world, and also provides a ready-made task force 10^30 cells strong that will do its best to find out how to live in a changing world.  The more stuff we destroy, the more Earth loses the ability to adapt to hard times.  Clear the rainforest to raise crops, and disease or natural disaster or pollution find it much easier to brutally rape the new, homogenized biosphere.

The argument is then extended to such things as preserving human languages, which record the results of thousands of experiments in creating human culture.  So nature is basically a billion billion whatever tiny lab books full of experiments, and instead of reading them, we’re throwing them out.

Nobel Sur-prize

Peter Coles at “In The Dark”

Particles are everywhere.  While you read this, particles are in your home, in your infant child’s crib.  In her anus.

I don’t understand them.  But here’s a fairly simple explanation of the work that won this year’s Nobel Prize in physics.  Basically, the uproar is that this guy Cabibbo had a big idea about physics that helped explain a mystery about particles.  Later, Kobayashi and Maskawa solved a mathematical problem that expanded on Cabibbo’s idea.  Both were important – the original idea and the difficult mathematical extension to it – but only one was awarded the prize.

Also check out a more basic article from Mark Chu-Carroll at “Good Math, Bad Math”

What positive psychology can help you become

Martin Seligman on TED

A talk interesting enough that I watched it twice.  The second time while smiling. Seligman decided to break happiness, or life satisfaction, into three categories.  (To me this is rather arbitrary.  It’s not like the categories of happiness are just sitting out there, waiting to be discovered.  But it’s a persistent plague among people who study such things to break them down into categories they believe are fundamental. i.e. “four personality types”, “two political ideologies” (left/right), or even “four kingdoms of life” (some people now say up to 13.  others 2))

The categories are: surface pleasures like active social life, good love life, and sensual pleasure; “flow”, or the state of intense focus and concentration associated with, say, rock climbing or physics sets; and “meaning”, or finding something greater than yourself to dedicate your life to.

Seligman describes the beginnings of a movement to apply a scientific approach to the study of happiness, as opposed to the traditional psychological model of simply curing mental illness and depression.  He claims that it is possible for people to increase the fulfillment they feel in life by a concentrated effort in the right direction.  It’s a summary of the beginning of a quest to understand people in a new way, and apply that understanding to make life better.

Worldmapper

A site you may have seen before.  They use maps of the world to visualize data.  For example, compare a map where each country’s size represents the number of personal computers in that country, to a map showing how many people died of “often preventable deaths”.

There are a lot of technically-interesting things about this project.  How did they get the countries to fit together, when their land area needs to be fixed at some arbitrary size?  What sort of properties of the standard world map’s topology were they trying to preserve?

But more interesting are the social, economic, and political insight you can get.  Compare this project to the Gapminder.

Small samples, and the margin of error

Terry Tao at “What’s New”

Terry Tao tones it down a notch to present something even I can understand.  He discusses how a random sampling of just 1000 people can give an accurate picture of the opinions of a nation of 200,000,000 voters.  He also gives a short proof of the accuracy of the sample, without resorting to the binomial distribution.