"Two, four, six, eight; bog in, don't wait." As children, we learn numbers can either be even or odd. And there are many ways to categorize numbers as even or odd. We may memorize the rule that ...

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An understanding of numbers is often viewed as a distinctly human faculty—a hallmark of our intelligence that, along with language, sets us apart from all other animals. Practically every animal that ...

Crows recently demonstrated an understanding of the concept of zero. It’s only the latest evidence of animals’ talents for numerical abstraction — which may still differ from our own grasp of numbers.