Friday the Thirteenth

Take a look at your calendar. Tomorrow is Friday the 13th!

You may not take drastic safety precautions every Friday the 13th, but are you totally immune to the superstition? Given the choice, would you get married, start a new job or close on a house on Friday the 13th? Most Americans wouldn't, even though they don't put much stock in the idea. Superstition has a way of creeping up on people when they're in a particularly vulnerable state.
How Stuff Works explains why we associate Friday the 13th with bad luck. Link


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Lori Dajose, CalTech Communications Officer: "The original 'rabbit illusion' was a tactile illusion," Dajose says. "You tap someone’s arm very quickly in two locations (let’s say point A and point B) repeatedly. When their eyes are closed, even though the tapping is only happening in two locations, they can feel the tapping 'hop' linearly across multiple locations on their arm between point A and point B. So for the audiovisual illusion, the 'rabbit' has to do with how the flash 'hops' across the screen."

From an article in Popular Mechanics­.
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