Is it possible to count objects you can't see? If you've ever received a boxed gift, or a mysterious package from Amazon, you might have tried to lightly shake the box to try to guess its contents.

Compulsively counting objects or actions is a common symptom of OCD. Exposure therapy can help you develop coping mechanisms when you encounter triggers. Obsessive-compulsive disorder (OCD) is a ...

Infants and animals are able to understand approximate quantities of different types, in terms of relative proportions of the numbers of different sets of objects, provided the difference in numbers ...