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Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Video: Factors that increase metabolic rate and heat production

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