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the microchip, although the micro chip would have never been invented with out electrical generators to give us A/C current. But without Steam Engines, electricity would have never been able to be as wide spread and inexpensive as it is. But engines, regardless of how they are powered, convert force into torque (twisting or rotating energy). This would never have been possible without the ......WHEEL. The wheel has made EVERYTHING we have from the simplest to the most complex machine possible.

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12y ago
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Q: What was the one invention that has made many complex machines possible?
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