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00:09:29
Have you ever really listened to a ball bounce? Exploratorium staff physicist Thomas Humphrey describes the elegant mathematics of a bouncing ball.

00:06:50
Despite my better judgment, I invite TI staff educator Eric Muller to do one more set of activities—several things you can do with soda straws.

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.

00:04:49
Senior Staff Scientist Thomas Humphrey invents a simple experiment to see if the Giant Mirror is spherical or parabolic, and then to see if it's perfectly spherical. By placing a Styrofoam ball at the center of curvature, he's able to prove that the mirror is out of pure sphericity by about one-quarter of one degree.

00:04:37
Staff Neuroscientist Richard Brown demonstrates that the Giant Mirror reflects infrared radiation as well as visible light.

00:52:10
Cheer on the competitors in this zany science cook-off. Teachers compete before a live audience at the Exploratorium for the revered title, "Iron Science Teacher." This week's secret ingredient: batteries.

00:07:42
How big does a mirror have to be for you to see yourself in it? Exploratorium staff physicist Thomas Humphrey describes an activity you can use in your classroom to investigate simple optics.

00:05:59
TI staff educator Eric Muller hits me up for change, and then demonstrates a neat science activity using dry ice.

00:01:59
Snow Mirror is the first in a series of pieces that celebrate slowness and black and white, in this piece the image of the viewer is created by the congregation and accumulation of white snow flakes in areas of the image that are brighter. The result is projected on a transparent silk fabric which creates a feeling of the flakes being suspended in space. Artist Daniel Rozin will be featured in the Exploratorium's 2009 exhibition, Reflections.