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This cool
device will baffle your students as they try to explain why this top keeps
on going! Just an easy clockwise twist will set this top spinning for an unbelievable
length of time. A tiny battery powered off-center motor maintains the rotational inertia of the
top making it appear to continue spinning on its own. While spinning
alternating red, green and blue LED lights are activated. Click the link
above for a complete explanation. Includes batteries for initial use and a
set of spares.
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