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25 Things That Are 'Common Knowledge' People Learned Embarrassingly Late in Life

They call it 'common knowledge' because most people know it. But is it really that common? Sometimes, the simplest facts or tricks are the ones that take us years to figure out. This gallery showcases examples of 'common' knowledge that people often learn the hard way, making us wonder why it took so long. Explore these surprising revelations, and don’t forget to share the bits of everyday wisdom that you discovered later than you'd like to admit!

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