What ouija boards and military contractors have in common

The power of suggestion, your own expectations, and even your emotions can cause your body to move without you actively telling it to. This weird phenomenon is called the ideomotor effect. It's what makes ouija boards work and it's the mechanism behind $60,000 bomb-detecting devices that an American company was recently caught selling to the Iraqi government. Needless to say, the devices did not actually detect bombs.
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