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Did you know that only human brain is capable of thinking in categories?

A rare specimen of the rest of Great Apes is capable of categorizing things in one "level" (e.g. banana, apple → food). Humans are capable of having multiple level categories with ease, e.g. banana, apple → fruits → food. Of course, you might even add a few more categories like "vegeterian" or "natural" in this chain.

This might seem really obvious to us, but it is an impossible task for any other animals.