The violet filter on the Imaging Science System aboard Voyager 1 and 2Many years ago, I said to a colleague, “What a beautiful shirt! Royal blue is a good color on you.” She replied, “What do you mean blue? This shirt is purple!” After some experimenting, we discovered that we consistently differed on the line between blue and purple. In extending our experiments to co-workers, we found that I was the outlier—most people saw blue and purple more like my colleague. It turns out that such differences are real; the proteins that detect light in our eyes can be tuned to slightly different wavelengths, and we can each have slightly different ratios of the three proteins that allow us to distinguish colors. I really do see blue where most people see purple. (Do you? Here’s a Buzzfeed quiz.)

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05.06.2016

Wristbands reading "Teach Evolution"A few weeks ago, we got an unusual query. A company—RapidWristbands.com—that manufactures the sorts of wristbands made famous by Lance Armstrong, wanted to donate the profits from a recent order to NCSE.

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The half-finished cupWhen we got married, my wife and I set aside part of the cup of wine traditional in a Jewish service, to be finished when marriage was available to everyone. Days before our wedding, Judge Vaughn Walker had struck down marriage segregation in California, but that decision was on hold until last year, when the Supreme Court sustained his ruling.

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