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How Many Colours Are In A Rainbow?

1h ago
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http://tomscott.com - http://twitter.com/tomscott - Yes, there are more than seven; but they include a few colours that most people can't see, too. We're going to trace a two-minute course through Isaac Newton, cataracts, Claude Monet, and the wonders of evolution. (The Trafalgar Square projection artwork was by Greyworld, as part of an advertising campaign; it's now been dismantled.)