Measurement

Use straight lines to learn about circles.

String and scissors are all you need to find pi all around you.

Use your cell phone to explore the mini-scopic world.

How far can you see into the water?

Which way is the water flowing?

Light gets dimmer the farther it travels–and a bit of simple math explains how.

Twenty-four columns record twenty-four hours of tide water levels.

Have a gas with the conservation of mass.

See yourself with infrared vision.

As a task becomes more complex, it requires more mental effort—and that takes time.

Stamp your feet and make a miniature earthquake.

Wispy lines show the path of tiny, high-energy particles generated by cosmic rays.

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