By NBC News — 2014
In his latest book, "The Future of the Mind," physicist Michio Kaku predicts that the Internet will morph into a "brain-net" of connected minds.
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CLEAR ALL
In 1937, a person could go to a newsstand and pick up a pack of cards for 10 cents. But these were no ordinary playing cards: They were Zener cards, developed to test one's friends for the presence of extrasensory perception, or ESP.