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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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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Blood is approximately twice as thick as water because of the cells and other components found in it.

Underwater World Underwater World
Routes for the human colonization of the New World and Pacific islands. Routes for the human colonization of the New World and Pacific islands.
A caduceus, the emblem of the medical profession. A caduceus, the emblem of the medical profession.
How Fast is the World's Population Growing? How Fast is the World's Population Growing?
Psychological Dimensions of the Visual World Psychological Dimensions of the Visual World
Video: Chloroplast Structure & Light Dependent Reactions (Photosystem 1 and 2 Cyclic Electron Flow)

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