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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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Your heart beats over 36 million times a year.

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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

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