Picture puzzles that ask you to count objects are surprisingly challenging, even when the image looks simple. The challenge is straightforward: count how many bananas are in the picture within 25 ...

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.

You often have to make quick judgments about the number of objects you encounter in the world. You might see a group of people walking toward you. It is useful to know whether there are roughly five, ...