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Asthma cases in Americans are about 75% higher today than they were in 1980.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.