Friday, February 24, 2012
Saturday, February 18, 2012
Monday, February 13, 2012
Sunday, February 12, 2012
Saturday, February 11, 2012
Thursday, February 9, 2012
Wednesday, February 8, 2012
Tuesday, February 7, 2012
Sunday, February 5, 2012
Do You See It
Stare at the red dot on this woman's nose for thirty seconds. Then, look over at a blank white space (a piece of paper or an empty browser tab will do). Did you see the "correct" version of the image? Here's how it works: stare long enough at an object and the eye's photoreceptors (particularly the color-sensitive cone cells) lose sensitivity from overstimulation. Divert the eyes to a blank space, and the surrounding cone cells send out a much stronger signal. The brain interprets this discrepancy as looking at the precise opposite colors, in what is known as a 'negative afterimage.' Nifty, no?
Saturday, February 4, 2012
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