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!

Wait for the people to get off the elevator before trying to enter. Giving_Cat: Or Subway or bus or… Marlsfarp: Generalize to: people exiting the more confined space have the right of way.

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