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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There are more sensory neurons in the tongue than in any other part of the body.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
The phenomenon of osmosis.
Raynaud’s phenomenon. Note the discoloration in the thumb and fingers.