Huntley-Fenner: Folks took that to be about
number. We looked at that question, to see whether
those results have to do with number or whether they're
due to something else.
Narrator: That something else may be reasoning.
Huntley-Fenner altered the same test using sand, a
Huntley-Fenner: We poured one pile of sand
in front of them so they could see it, then we hid
it and we poured another pile of sand in a different
location. And then the screen came down and by magic,
there was only one there. In that case babies didn't
care if there was only one pile of sand. We wanted
to argue that in a fundamental way, babies are like
adults. That is, they divide the world into things
that you will track as individuals and things that
you won't try to treat as an individual.
Narrator: For Science Today, I'm Larissa Branin.