Counting is a skill that children develop in stages. If you present a young toddler with three blocks, the child may well look at them and say, "One, one, one." Each word acts as a placeholder to ...

Crows count, too, and they can do it out loud. Here's science reporter Ari Daniel. ARI DANIEL, BYLINE: Let's say I put three blocks in front of a young toddler. Instead of counting one ...