Picture puzzles that ask you to count objects are surprisingly challenging, even when the image looks simple. The challenge ...

Counting objects is easy whenthe objects have regular motion,but it becomes more difficult when theobjects vibrate or you have to manuallymove them. To deal with this problem,you need a reliable, ...

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.