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Did you know?
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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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There are more sensory neurons in the tongue than in any other part of the body.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.