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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
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On average, the stomach produces 2 L of hydrochloric acid per day.