People are sharing facts they learned at embarrassingly late ages and it’s truly mind-blowing

You can't help not knowing something.

How are you supposed to know what you're supposed to know if you don't know it? If you knew what you're supposed to know then you'd know what you need to know and could go about knowing it. My head hurts. Over on Reddit, people have been sharing facts that they didn't learn until later in life, late enough for it to be embarrassing. In some cases, seriously embarrassing. For example...