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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

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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.

Structure and basic function of a typical vertebrate neuron and associated glial cells. Structure and basic function of a typical vertebrate neuron and associated glial cells.
Conduction system of the heart. Conduction system of the heart.
The immune system has several different components that work in concert. The immune system has several different components that work in concert.
Block Diagram of Single-stage Pressure System for Dual-Stage Pressure Production of Nitric Acid Block Diagram of Single-stage Pressure System for Dual-Stage Pressure Production of Nitric Acid
The Climate System The Climate System
Typical vein patterns in eudicot and monocot leaves Typical vein patterns in eudicot and monocot leaves
Video: Four Giant Convection Cells oF Earth

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