Eric Mead: The Magic of the Placebo -- can you explain the hatpin illusion? [video]
source: http://scienceblogs.com/grrlscientist/2010/03/tedtalks_eric_mead_the_magic_o.php
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Sugar pills, injections of nothing -- studies show that, more often than you'd expect, placebos really work. At TEDMED, magician Eric Mead does a trick to prove that, even when you know something's not real, you can still react as powerfully as if it is. (Warning: This talk is not suitable for viewers who are disturbed by needles or blood.)