It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
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Approximately 70,000 people in the U.S. are both blind and deaf!
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Up to the age of six or seven months a child can breathe and swallow at the same time. An adult cannot do this.
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Studies suggest that people who appear to be constantly distracted have more "working memory" and "sharper brains".
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People with blue eyes are better able to see in the dark.
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Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
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