When a wheel falls off Sid's favorite toy truck, he tapes it back on. But now the wheel won't spin, and Sid wonders how exactly wheels work? At school, Sid explores how wheels are simple machines that help move all kinds of things like cars, trains, tricycles, and even toy trucks!

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  • Episode Number 21
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  • Originally Aired Monday, February 9, 2009
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  • Last Updated By mechagrover
  • Last Updated 12/22/2014 1:16pm