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00:01:54
The science behind the water bottle membranophone, including a discussion of how air vibrates the instrument's membrane, producing sound.

00:00:45
An introduction to a spinning disc called a stroboscope, which lets you create your own animated cartoon.

00:04:32
A detailed demonstration of how to make a stroboscope, including a discussion of materials needed.

00:00:47
The science behind the Whirling Watcher stroboscope, including a discussion of the phenomenon called persistence of vision, which in this activity creates the illusion of a galloping horse.

00:01:32
An introduction to the jitterbug, a simple motorized toy made of a recycled CD and a DC motor.

00:10:57
A detailed demonstration of how to make this toy, including a discussion of materials needed.

00:01:41
The science behind this toy, including a discussion of how electric circuits work, and how an unbalanced load (an off-center weight on your jitterbug) results in rotational vibration.

00:31:28
Hear more from scientists working on the Ice Cube telescope at the South Pole.

00:46:36
Meet glaciologist Slawek Tulaczyk and his team, who work in the fast-emerging field of ice sheet dynamics. They speak to us just after returning from a month at a remote camp on the West Antarctic Ice Sheet.

00:23:54
Watch as three giant helium balloons are launched above Antarctica to study climate history; listen as scientists talk about balloon research.