AP - Two signs of trouble elsewhere in the world pushed U.S. stocks lower: slowing economic growth in China and a possible hitch in a deal to get Greece its bailout money.
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This dog does not exist
Last week Robert Krulwich, a co-host of the wonderful program Radiolab, Pluto?d pink. In a blog post he noted that pink doesn?t occupy a slot in the familiar colors of the rainbow?there?s no P in Roy G. Biv. From this, he concludes that pink does not really exist:
That?s why pink is an invention. It?s not a name we give to something out there. Pink isn?t out there.
True, no single wavelength of light appears pink. Pink requires a mixture of red and purple light?colors from opposite ends of the visible spectrum. Easy enough to do, and no seeming threat to pink?s ontological status. (Although this property does imply that the laws of the universe have conspired against pink lasers.)
The trouble begins when Krulwich imagines the visible spectrum curling up into a circle, with pink the missing slice between red and purple. ?Pink happens when the red and violet sides get together, but they don?t get together?which makes pink an act of wishful thinking, or, to put it bluntly?pink is a made up color,? he writes.
Perhaps you are as confused by this statement as I am (and, I suspect, Krulwich is). He cites as evidence a short animated video from the ordinarily great Minute Physics team. I?ve embedded the video below so you can watch for yourself, but the important part for our purposes is their explanation of where pink comes from:
If you try to roll up the rainbow to make a color wheel, there will be a gap between red and violet. That?s where all of the rest of the light in the universe is supposed to go?radio waves, microwaves, infrared, ultraviolet, x-rays, gamma rays and so on. But since we can?t see any of those wavelengths, we replace all of that hidden grandeur with pink.
This explanation is so muddle-headed and absurd that I hardly know where to begin. The classical electromagnetic spectrum extends from a wavelength of zero meters all the way up to infinity. How is one to connect those two ends? And even if one could, adding two (or more) invisible wavelengths together would never produce something visible. Infrared light plus ultraviolet light is just that?a combination of infrared and ultraviolet. They do not average out to yellow.
On a more fundamental level, however, Krulwich is right. Pink is not out there, because no color is really ?out there.? The world is full of electromagnetic radiation, and the only intrinsic properties that this radiation possesses are physical ones such as wavelength and intensity. Color, on the other hand, is all in your head. ?Color is not actually a property of light or of objects that reflect light,? wrote the biologist Timothy H. Goldsmith in his 2006 Scientific American article What Birds See. ?It is a sensation that arises within the brain.? My colleagues at Scientific American Mind have for years been elucidating the ways in which the optic system converts electromagnetic radiation into color, a mysterious and fascinating process (and one that can go wrong in interesting ways). Recent research even indicates that people can be made to see ?forbidden colors??greens that are tinted red, or blues that appear yellow.
Pink is real?or it is not?but it is just as real or not-real as red, orange, yellow, green, blue, indigo and violet.
The reddish green question will have to wait for another day.
?
Photo by jonner on Flickr.
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Pentax offers 'special edition' K-5 DSLR kit: silver body, 40mm slimline lens, $1,600 originally appeared on Engadget on Sun, 04 Mar 2012 04:29:00 EDT. Please see our terms for use of feeds.
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We'll focus on?efforts to help veterans find?jobs and deal with health and family problems. "One of the great blessings in my life has been the exposure I've received to the military?active duty, in the field and veterans,"?says Brian Williams. "They are America?s genuine heroes, and it's a privilege to use our platforms at NBC News to honor all that they have done."
Source: http://www.msnbc.msn.com/id/40153870/vp/46580315#46580315
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