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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

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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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The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

Adolescent white lion in Kruger National Park, South Africa. Adolescent white lion in Kruger National Park, South Africa.
White Lion cub at Kromdraai, South Africa White Lion cub at Kromdraai, South Africa
White-winged Duck or White-winged Wood Duck (Asarcornis scutulata) White-winged Duck or White-winged Wood Duck (Asarcornis scutulata)
The five different types of leukocytes (white blood cells). The five different types of leukocytes (white blood cells).
Drugs Commonly Stocked in an Emergency Medical Box Drugs Commonly Stocked in an Emergency Medical Box
Video: HIV replication/ Replication cycle of HIV

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