The trick that makes spot-the-difference puzzles ridiculously easy
Daniel Wirtz thought he was watching a child prodigy at work. The 9-year-old girl on a German game show was solving complex spot-the-difference puzzles in seconds. "To my eye, both images looked exactly the same," Wirtz writes in his blog. "But it took her only a couple of seconds to call out that one coffee bean was missing."
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