Those endless numbers of YouTube videos showing babies an...

Those endless numbers of YouTube videos showing babies and toddlers using iPads finally have some value: researchers are studying the clips to see how toddlers tap and swish.

Of course, academics are horrified that the ages of these young video stars can’t be confirmed and there’s little opportunity to follow them for long-term study.

But analysis might reveal points that will prove helpful to developers working on television shows and educational apps.