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Because the Earth spins in the same direction that the Moon orbits, our bump leads the Moon a little. If the Moon orbited in the opposite direction, or even orbited so fast that its orbit were faster than the Earth’s spin, then the bump would trail the Moon. The bump itself has...
There is one other challenge that our growing need for concrete has given us, that has nothing to do with carbon emissions: the global sand shortage. We need the sand to make the concrete, and sand mining has reached a critical point in many parts of the world. So that's a very real...