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00:17:15
Join exhibit developer Charles Sowers as he demonstrates Watch Water Freeze, an exhibit designed to encourage noticing. Patience with this piece is rewarded with breathtaking patterns of ice crystals. Viewed through a polarizing filter, the beautiful colors and crystalline structures of Watch Water Freeze have inspired countless museum visitors to reach for their cameras.

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.

01:36:04
Join A, K. C. Cole, author of Something Incredibly Wonderful Happens: Frank Oppenheimer and the World He Made Up, in conversation with Exploratorium Director Dr. Dennis Bartels, eminent San Francisco Chronicle science writer David Perlman, Cinema Arts Director Liz Keim, and Exploratorium physicist Thomas Humphrey. A question-and-answer session followed the panel discussion.

00:05:54
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.

00:02:54
In November 2009, Exploratorium After Dark welcomed particle physicist Dr. Austin Richards—aka Dr. MegaVolt. Under the Palace of Fine Arts rotunda, he jousted with a high-voltage Tesla coil, which generated 200,000 volts of electricity and shot 14-foot-long arcs of lightning through the air.

00:04:52
What do polarized sunglasses have to do with dog urine? Listen to this curious story from staff physicist Paul Doherty.

00:09:30
TI program participant Mark Hespenheide presents an elegant illustration of free fall using string and paper clips.

00:00:38
This electrifying After Dark event featured Austin Richards, Ph.D.—aka, Dr. MegaVolt®—jousting with 14-foot electrical arcs from his high-voltage Tesla coil on the evening of Thursday, November 5, 2009. This wonderful performance contributed to the celebration of the Exploratorium’s 40th Anniversary.

00:33:08
Is water ice present or absent in a crater near the moon's south pole? NASA’s Lunar CRater Observing and Sensing Satellite (LCROSS) mission is seeking a definitive answer. Join Exploratorium staff for a special Webcast featuring live coverage of LCROSS crashing into the moon! Our team will be broadcasting live from the 36" Refractor Telescope at Lick Observatory on Mt. Hamilton, where we’ll watch the impact and investigate how this intentional crash could reveal the existence of water ice.

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.