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Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. The idea of an animal that ...

I remember watching my 3-year-old niece, Avi, try to organize her toy cars. She wasn't counting them yet, but she would say, “This one goes near the red one,” and “I want more cars here!” At the time, ...