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Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
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There are 60,000 miles of blood vessels in every adult human.