Have you ever been so sure of a specific memory — maybe something you experienced as a child — that you later found out never actually happened? Our brains are complex and difficult to understand, and they are capable of tricking us into believing alternative facts and thinking we know things that are simply untrue.

In SciShow’s video “Do You Really Know What You Think You Do?”, host Hank Green explores some phenomena that occur in the brain to make people believe that they know more than they do, or that they have superior reasoning.

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Scientific studies have shown that our brains remember some subjects or facts better than others, but it’s still unclear how the mind decides which information is important enough to keep.

Some studies researching this ask people if they know about things that are, well, completely fictitious. According to SciShow’s video, results showed that “instead of admitting ignorance, 110 of the 124 people in the study claimed to know about or be familiar with of the invented ideas,” Green explains.

Want to know more about the science behind how your brain processes knowledge? Watch the video above.

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