Links for 2010-11-03

  • "After watching this episode, a colleague had a great question:

    "How fast would the MythBusters have to go to make this trick work?"

    Interesting. In their last attempt, they had the motorcycle going around 100 mph. It did't work, but some of the stuff did stay on the table. What if they went faster? Could it work?"

  • My disregard for the Charles Murray line of argument is based on any number of things, but one of them is precisely the recognition of a culture of poverty among the people he claims to valorize. They're proud of their ignorance. Ignorance is not a principled position. [...] Petulance is not constructive. And manipulating the ignorant with appeals to their worst instincts so you can rob them blind is disgusting.

    No, I don't watch ultimate fighting, or follow NASCAR. Instead I advocate (and vote) for health care for everybody, and education good enough to help the next generation of kids like me to get the hell out of the backwater in which they're stuck. Best case, I'd hope that some of the kids who might have been confined to burnout status back in the day might find some constructive reason to actually care about something. Give them something to lose, and maybe they'll actually step up. If they don't, at least they had a shot."

  • "It has been proposed that all the colors in the universe originate from a mere fifteen fundamental physical causes. These causes appear over and over, lending color to the world around us. Some common causes seem logical - for example, both light bulbs and candles are colored by incandescence - and others are surprising - did you know that the colors of peacock feathers and bubbles are both caused by interference? Very small additions of an impurity can transform transparent corundum into a gorgeous red ruby. The same mechanism makes emeralds green and produces the color in some glazes and enamels."
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In addition to doing vertex and face colorings of a graph, you can also do edge colorings. In an edge coloring, no two edges which are incident on the same vertex can share the same color.
All of you are probably familiar with color opponency, but just in case, I'll give you a quick refresher. I'll even start with the history. In the 19th century, there were two competing theories of color vision.
Adults have been found cross-culturally to prefer blue to other colors. It's a nearly universal preference. But does this preference occur naturally, or do children and infants have different preferences? Prior to 2001, there wasn't a definitive answer to this question.