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Did you know?
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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Your heart beats over 36 million times a year.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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There are more nerve cells in one human brain than there are stars in the Milky Way.