We grow up in different circumstances, and it's impossible for everyone to develop the same worldview. Still, for society to function, we expect certain stuff to be universally understood — fundamental facts that people can agree on and rely on. But that isn't always the case.

Reddit user JustBeingElara recently asked the platform what common knowledge they realized wasn't so common.

Thousands replied, sharing etiquette rules, marketing tricks, basic biology, and much more, teaching each other all sorts of useful things. So we decided to collect the most interesting ones for those who love to learn!

Discover more in “I Didn’t Know This And Now I Feel Stupid”: 48 Pieces Of Knowledge That Were Supposed To Be Common

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