article:
http://www.scientificamerican.com/blog/post.cfm?id=color-changing-dots-earn-b... one of several videos:
(the dots appear to stop changing color when they began to rotate, but the actually continue to change color)
http://www.scientificamerican.com/blog/post.cfm?id=color-changing-dots-earn-b... one of several videos:
(the dots appear to stop changing color when they began to rotate, but the actually continue to change color)
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