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- Video of a very inefficient concrete drill (read description) http://www.youtube.com/watch?fmt=18&v=5q-BH-tvxEg 2 comments
- Hypothetically speaking, what WOULD happen to the concrete? https://youtu.be/5q-BH-tvxEg 5 comments askscience
- Even though the first gear is rotating at 200 revolutions per minute the last gear will still take more than two trillion years to make one turn.[VIDEO] http://www.youtube.com/watch?v=5q-bh-tvxeg 32 comments science
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