One of the most wonderful things about children is their curiosity and eagerness to learn.

So, when they ask about things which seem like common knowledge to most adults, we will explain in detail with excitement, simultaneously broadening their horizons and, hopefully, improving their future decisions.

When we have to explain these same given facts to adults, however, we usually first greet them with a raised eyebrow, and force ourselves to hide our disbelief.

As no matter their education or upbringing, there are certain things one feels it should be safe to assume all adults know.

Redditor Lo-Fi_Kuzco was curious to hear things the Reddit community couldn't believe they had to explain to adults, leading them to ask:

"What's something you can't believe you had to explain to a grown adult?"
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