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Exploratorium graphic artist David Barker describes the physics of baseball bats, and makes some sweet music in the process!

Staff educator Modesto Tamez tells how he gets students exploring electromagnets, a great preparation for making an electric motor.

TI staff educator Eric Muller explains how to make your own record player!

It can be hard to make ideas about size and scale relevant to students’ lives. Children’s book author David Schwartz explains a series of neat real-world comparisons from his book that really get the concepts across.

Which is farthest away from the earth, the stars or Pluto? The answer may be obvious to you, but a lot of people get this wrong. Listen to TI director Linda Shore as she presents a little survey about how things are arranged in the heavens—and explains what the surprising results mean.

Exploratorium staff physicist Thomas Humphrey divulges a clever way to measure the speed of sound, and he explains how he’s used that information to measure things in the world.

The ancient Greeks knew about magnets, and they knew about electricity, too. But it wasn’t until the nineteenth century that a connection between the two was discovered. Staff physicist Paul Doherty tells the story of how a professor made the connection…which led to modern motors.

TI staff biologist Karen Kalumuck busts some of the myths about taste, and presents a few fun activities for the classroom.

A stack of blocks seems to defy gravity in this activity by Exploratorium staff educator Don Rathjen.

A veteran teacher describes his first year of teaching, and the myriad things he adjusted to while he learned the profession he loves.