Warning: This video isn't kidding about its title. Don't believe us? Go ahead and press play.
Famed debunker and history buff CGP Grey took to his YouTube channel to explain an overlooked (and annoying) facet of our collective brains. Don't worry; it gets less difficult to watch very abruptly after the 30-second mark.
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The placebo effect can easily trick our minds, but this video takes it a layer deeper: It's known as nocebo, something harmless that causes harm because you believe it's harmful. Take a look and reflect on how often your brain dupes you.
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