"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 ...

Practically every animal that scientists have studied—insects and cephalopods, amphibians and reptiles, birds and mammals—can distinguish between different numbers of objects in a set or sounds in a ...

Most people think that only people can understand numbers, but that's not true. Many animals can naturally figure out how much something costs, see patterns, and make decisions based on simple math.