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The numbers speak for themselves. Cycling can be at least four times more energy-efficient than walking and eight times more ...
It's estimated that there are more than a billion bikes in the world - and there's a good reason for that. Cycling is ...
There are more than a billion bicycles in the world - and even London is set to have a new tunnel under the Thames with a ...
This article was originally published with the title “ Circular Motion and Rectilinear Motion ” in Scientific American Magazine Vol. 21 No. 17 (October 1869), p. 265 doi:10.1038 ...