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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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Medication errors are three times higher among children and infants than with adults.

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Thyroid conditions may make getting pregnant impossible.

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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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Video: HIV Infection: Viral life cycle

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