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   The Sphere of Fear

Hiding behind every amazing feat is a great application of physics.  Many circus performances include something known as the sphere of fear, or circle of doom, or the Globe of Death.  The basic design consists of a metal cage in the shape of a sphere that is big enough to allow a motorcycle or two to ride around inside. If the rider goes fast enough they can even ride upside-down or around the side of the sphere without falling.  If you are interested in...

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