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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Thyroid conditions may make getting pregnant impossible.
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There are 20 feet of blood vessels in each square inch of human skin.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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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.
6-8 Earth’s Major Tectonic Plates
major endocrine gland
Adapoids and omomyoids had longer snouts and are the first “true” primates.