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Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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The human body produces and destroys 15 million blood cells every second.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.