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The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

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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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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his 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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

The 20 amino acids found in living organisms The 20 amino acids found in living organisms
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Ribonucleotides containing unusual nitrogenous bases are found in transfer RNA Ribonucleotides containing unusual nitrogenous bases are found in transfer RNA
Vocal cords in the larynx. Action of skeletal muscle in the cords alters the width of the glottis, t Vocal cords in the larynx. Action of skeletal muscle in the cords alters the width of the glottis, t
Video: Phases of the Female Reproductive Cycle - Hormonal regulation

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