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.
