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00:03:53
Join Exploratorium educator Ken Finn as he unlocks the mystery behind the black sand (a.k.a. magnetite) at Ocean Beach. This piece explores the origin of magnetite in the Sierra Nevada mountains, its journey down the Sacramento and San Joaquin rivers to the Bay, and the interesting physical properties of this mineral, plus some fun things you can do with it.

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

00:00:40
An introduction to the stripped-down motor, a simple and easy-to-make version of the electric motors found in toys, tools, and appliances.

00:01:16
A detailed description of the simple materials needed to make a stripped-down motor.

00:02:48
A step-by-step demonstration of how to make the stand for the stripped-down motor.

00:05:16
A step-by-step demonstration of how to make the coil for the stripped-down motor.

00:01:41
How the stripped-down motor works, including a discussion of how electricity and magnetism combine to drive the machine.

00:01:26
Troubleshooting tips for making sure your stripped-down motor works well.

00:01:29
A more detailed explanation of how the stripped-down motor works.

1:04:33
Watch as the best teachers on the planet battle it out for the title of Iron Science Teacher. In this zany competition teachers will have ten minutes to create a science activity. This week’s “secret” ingredient: corks!