More than 150 years ago, the economist and philosopher William Stanley Jevons discovered something curious about the number four. While musing about how the mind conceives of numbers, he tossed a ...

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.

At the intersection of psychology and neuroscience is a phenomena called “number sense”—an intuition of the magnitude and relationships of numbers that is found in humans. In children and adolescents, ...