We learn to count at such an early age that we tend to take the notion of abstract numbers for granted. We know the word “two” and the symbol “2” express a quantity that we can attach to apples, ...
"Numbers are a human invention, and they’re not something we get automatically from nature," says Caleb Everett. Kwangmoozaa/iStock Once you learn numbers, it’s hard to unwrap your brain from their ...
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