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I first posted “The Inefficiency of Humans” in January 2017. It’s about the reasons that our energy metabolism provides only about 20-25% of the energy we consume as food for muscular work. I referred to this as our “inefficiency”, although it isn’t really that. The explanation and conclusions remain largely unchanged, but since then I’ve learned more about how energy metabolism is measured, so I’ve rewritten the post as this 2.0 version. Much of the original is unchanged.… Read the rest “The Inefficiency of Humans”

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Jesse Owens starting the 200 meter race at the 1936 Olympics. Reproduction of photograph in “Die Olympischen Spiele, 1936” p.27, 1936. 

Coverage of the recent victory of the New Zealand team in the America’s Cup yacht race featured sailboats flying along on their underwater foils at ridiculous speed, speeds reaching more than 50 miles (80 km) per hour. Whether it’s running, or driving a car, or sailing these mutant boats, speed is exciting.Read the rest “Speed Limits”