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 ...

CHILDS VOICE: Welcome to counting with Rooodd! RODD: Oh Heh! Number squad! It's you! Thank you - you are too kind!! Oh… a package! Ah…. Be right back. Ooh, heh heh … how exciting. I wonder what it is.

In 1992, Karen Wynn’s numbers came in big. The numbers in question were tiny in an absolute sense, but they counted for a lot among investigators of child development. The reason: Wynn claimed to have ...