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Did you know?

Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.

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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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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.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

DNA molecules replicate to form identical chromatids DNA molecules replicate to form identical chromatids
DNA molecules replicate to form identical chromatids DNA molecules replicate to form identical chromatids
Proportions of the genetic and physical maps are similar but not identical Proportions of the genetic and physical maps are similar but not identical
Fossil remains of anatomically modern humans from the Czech Republic and from China (center crania) Fossil remains of anatomically modern humans from the Czech Republic and from China (center crania)
Identical Twin Identical Twin
1.6 Organisms are made up of cells, each of which contains an identical set of genes. 1.6 Organisms are made up of cells, each of which contains an identical set of genes.
Video: Protein Structure - Primary, Secondary, Tertiary and Quaternary

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