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The average adult has about 21 square feet of skin.

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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

Attack systems of pathogenic bacteria. Attack systems of pathogenic bacteria.
Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants. Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants.
Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants. Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants.
Typhus bacteria Typhus bacteria
Petri dish containing fecal bacteria cultures. Petri dish containing fecal bacteria cultures.
Calculating Growth Rate of Bacteria Calculating Growth Rate of Bacteria
Video: Introduction to Insulin

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