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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The human body produces and destroys 15 million blood cells every second.
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Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
Structure of the DNA double helix
Quaternary structure of deoxyhemoglobin. (PDB ID 2HHB)