Fingers, pebbles, and wiggly marks

The marvelous counting machine

Imagine that it is five thousand years ago and that you are a rich merchant in the ancient city of Babylon. You have a curly black beard and a purple robe with yellow fringe at the bottom. You’re…

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Hear All About It

What is sound?

> Sound comes from just about everywhere— from friends talking, radios > playing, jet planes roaring overhead. Even your breathing makes a tiny > sound. > > None of these sounds seem very much…

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Mathemagic

A moving numbers game

You can play this game by yourself, on the floor or on a table. You need only five playing cards—an ace, 2, 3, 4, and 5. Lay the cards out just as they are shown in the picture at the top of this…

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