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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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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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The horizontal fraction bar was introduced by the Arabs.

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Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

The major muscles of the human body, anterior side. The major muscles of the human body, anterior side.
A peroxidation reaction involving a fatty acid is depicted in the figure below. A peroxidation reaction involving a fatty acid is depicted in the figure below.
Major Degenerative Diseases of the Central Nervous System Major Degenerative Diseases of the Central Nervous System
(a) Multiple myeloma: Tumor of plasma cells. (b) Myeloma cells grow within the bone and lesions can ... (a) Multiple myeloma: Tumor of plasma cells. (b) Myeloma cells grow within the bone and lesions can ...
Mixed dishes such as hamburgers and pizza are a major source of solid fats in the diets of Americans Mixed dishes such as hamburgers and pizza are a major source of solid fats in the diets of Americans
Amino Acids Amino Acids
Video: Darwin's Observation (Fossils, Galapagos Islands & Africa ) and Natural Selection (Adaptive Traits)

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