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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.

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As many as 20% of Americans have been infected by the fungus known as Histoplasmosis. While most people are asymptomatic or only have slight symptoms, infection can progress to a rapid and potentially fatal superinfection.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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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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