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00:04:48
Sarah Santos and Jeremy Rector demonstrate two ways to make ferrofluid during a live Webcast of the Exploratorium's Iron Science Teacher. Watch the whole episode (type "oil" in the search box), along with many other episodes of Iron Science Teacher at www.exploratorium.edu/tv

00:07:49
Children’s book author David Schwartz shares some creative ways kids and teachers have used his books to look at big numbers.

00:05:32
Our host, Stephanie Chasteen, shares some fun facts and activities having to do with the science of sound.

00:00:44
This is a time-lapse movie of a chain reaction activity presented at the Exploratorium booth during Maker Faire 2009. Participants were asked to build a portion of a collective chain reaction contraption, which was set off twice during the day. Photos were taken every 30 seconds and then joined in a 24 fps movie.

00:00:36
This is a time-lapse movie of a chain reaction activity presented at the Exploratorium booth during Maker Faire 2009. Participants were asked to build a portion of a collective chain reaction contraption, which was set off twice during the day. Photos were taken every 30 seconds and then joined in a 24 fps movie.

00:54:21
Cheer on the competitors in this zany science cook-off. This week's secret ingredient was nuts and bolts

00:16:24
In conjunction with this summer's special exhibition Reflections, Exploratorium Senior Scientist Paul Doherty joins us for a hands-on Webcast. What effect does looking through two mirrors have on an image? Or three mirrors?

00:11:02
TI staff biologist Karen Kalumuck breaks down the news about the mysterious ailment afflicting our country’s bees. Why does it matter, and what can we do about it?

00:05:28
Sometimes kids don’t have much experience with nature. TI teacher coach Kim Marie Hansen recounts how she got her inner city students outside and observing the world by using nature journals.

00:03:53
Got a tough kid in your class? TI Staff Educator Modesto Tamez tells a story from his teaching career—explaining a powerful technique that has helped him win over the stubborn, negative students.