^ the lubricants used in a bicycle's moving parts need not be petroleum based, however.
in a real sense though, riding a bike does require energy, just as any other form of transportation does, even walking, and someone did the calcs and determined that the bicycle is the single most efficient means of transportation ever devised. yes, mile for mile, riding a bike is even more efficient than walking. if you convert food calories into their gasoline energy equivalents, riding a bike gets somewhere on the order of 1,400 mpg!
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"Missing middle" housing can be a great middle ground for many middle class families.
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