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■ The human body has changed more in the past 100 years than in the previous 50,000. Adults are 50% heavier and four inches taller.
■ 100,000 years ago, there were barely enough people on Earth to fill a football stadium.
■ Ancient Rome was eight times more densely populated than New York today.
■ When Columbus “discovered” the New World, there were already 90 million people in the Americas, a third of the world’s population.

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