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00:04:22
For John Edmark, geometry is a foundation for creating beauty. Here he explains his interest in unexpected natural phenemona, and how visitors to his kaleidoscopic piece, The Geometron, can turn simple shapes into surprisingly intricate patterns of reflection.

01:23:00
In this gem from 1990, we get a brief peek into the flourishing mind of German-born composer/sculptor Trimpin, a MacArthur "genius" award winner and the subject of a recent feature documentary. He chronicles his unique adventures through sound and music making, takes audience questions, and stages modified versions of his musical installations in front of the live audience.

00:08:39
Geeks have strange hobbies. Staff physicist Paul Doherty plays the corrugated plastic tube, also known as a “whirly,” and explains the surprising science behind the sound.

00:09:39
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.

00:05:23
Our host, Stephanie Chasteen, shares some more fun facts and activities having to do with the science of sound.

00:00:51
An introduction to how to make your own simple speaker, which transmits sound from a radio or MP3 player and demonstrates the principles of electromagnetism and vibration.

00:06:43
A detailed demonstration of how to make a cup speaker, including a discussion of materials needed.

00:02:25
The science behind the Cup Speaker activity, including how electromagnets work, and how in this activity the magnet pushes the bottom of a cup back and forth, vibrating the air and creating sound.

00:00:59
Exhibit developer Erik Thogersen backs away from the Giant Mirror. Watch his image change as he passes through the focal point, then continues on past the center of curvature.

00:04:53
At the Giant Mirror, Senior Staff Scientist Paul Doherty demonstrates a simple way of locating a real image—an image that floats in space in front of the mirror.