Word spreads like wildfire and if it’s not true, then it goes around even faster. That’s one of the ways how gossip, fake news and old wives' tales are born.
To reverse the process is no easy feat, even if we have unlimited resources to fact-check every bit of information we get. So folks on Reddit took it upon themselves to make others aware that you don’t actually use only 10% of your brain and a watermelon won’t grow in your belly if you swallow a seed.