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.

This year, NMNH director Kirk Johnson helped spearhead an effort to add up the collections of the world’s largest museums Jack Tamisiea A small fraction of the more than 50 million specimens housed in ...

For more than a century, researchers have known that people are generally very good at eyeballing quantities of four or fewer items. But performance at sizing up ...