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Energies
“A man riding a bike will go up to three and four times faster than a walking man, consuming up to a fifth of it’s energy: to carry a gram of one’s weight for a kilometre on a flat road he will burn roughly 0,15 calories. The bicycle is the perfect translation to link one’s metabolic energy to its locomotive impediment. With this instrument, man can efficiently overtake any car and any animal.
Ivan Illich, A history of needs – degrees of auto mobility
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