We all have at least a few gaps in our knowledge—that’s no secret. That being said, it genuinely feels like there are some core bits of education and fundamental life skills that every grownup should be well-versed in.

Members of the AskReddit subreddit took to a couple of mind-boggling online threads to share the things they’ve personally witnessed other adults not know, from how elementary biology works to how (not) to treat others. Scroll down to read the seemingly common sense things they’ve had to explain to grownups. But be warned, you might want to cringe and facepalm.

Vaccines work The Human is the cause for extreme climate change Making better Gun Control Laws will reduce Gun Violence.

That Freedom of Speech doesn't mean you can say whatever you want, without consequences of an

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