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There are more sensory neurons in the tongue than in any other part of the body.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

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There are approximately 3 million unintended pregnancies in the United States each year.

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