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April 22, 2013 01:38 pm PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/M4XCwhtWjrY/story01.htm
The men who tickle rats
Apparently, if you tickle a rat it will respond with vocalizations that scientists have good reason to interpret as happy ones. Basically, it's the rat equivalent of laughter, only at ultrasonic frequencies that the human ear can't detect on its own. What's more, tickling rats on a regular basis appears to reduce the negative effects [...]Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/M4XCwhtWjrY/story01.htm
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