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“Almost any seat was comfortable at one-sixth of a gravity.”
― Arthur C. Clarke, 2061: Odyssey Three

“Food processors, dishwashers, vacuum cleaners, and clothes-washing machines have substancially lessened the physical activity required to cook and clean. Air conditioners and central heating have decreased how much energy our bodies spend to maintain a stable body temperature. Countless other devices, such as electric can openers, remote controls, electric razors and suitcases on wheels, have reduced, calorie by calorie, the amount of energy we expend to exist.”
― Daniel E. Lieberman, The Story of the Human Body: Evolution, Health, and Disease

“Nothing over the last few million years of human history has changed human energetics as much as the low cost of working at a desk using machines run by electric power.”
― Daniel E. Lieberman, The Story of the Human Body: Evolution, Health, and Disease

“One of the ironies of industrialization is that its spread across the globe has required more people to spend more time sitting.”
― Daniel E. Lieberman, The Story of the Human Body: Evolution, Health, and Disease

“In short, the Industrial Revolution was actually a combination of technological, economical, scientific and social transformations that rapidly and radically altered the course of history and reconfigured the face of the planet in less than ten generations -a true blink of an eye by the standards of evolutionary time.”
― Daniel E. Lieberman, The Story of the Human Body: Evolution, Health, and Disease

“The bottom line, is that fat is vital for all species, but specially for humans.”
― Daniel E. Lieberman, The Story of the Human Body: Evolution, Health, and Disease

“Just as not requiring a child to reason critically will stunt her intellect, not stressing a child's bones, muscles and immune systems will fail to match these organ's capacities to their demands.”
― Daniel E. Lieberman, The Story of the Human Body: Evolution, Health, and Disease