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Categories: Gr 4-6 Science & Tech
A gear is a toothed wheel that connects or meshes with another gear. It is used to transmit forces in machines that range from something as small as a watch to something as large as the locks on a... read more
https://youtu.be/xOFH57Do2EM For most of human history, we had a lot of bad ideas about how we were getting sick: angry gods, misaligned planets, stinky fumes. We also had plenty of bad ideas about... read more
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