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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

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The cure for trichomoniasis is easy as long as the patient does not drink alcoholic beverages for 24 hours. Just a single dose of medication is needed to rid the body of the disease. However, without proper precautions, an individual may contract the disease repeatedly. In fact, most people develop trichomoniasis again within three months of their last treatment.

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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

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People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

Genetic control of flower symmetry. Genetic control of flower symmetry.
The control of breathing via respiratory centres in the mammalian brain. The control of breathing via respiratory centres in the mammalian brain.
Negative feedback control of a regulated variable. Negative feedback control of a regulated variable.
Distance from Initial Change in Membrane Potential vs. Voltage Change Relative to Initial Change Distance from Initial Change in Membrane Potential vs. Voltage Change Relative to Initial Change
With a three-way catalytic converter, emission control is most efficient with an air–fuel ratio ... With a three-way catalytic converter, emission control is most efficient with an air–fuel ratio ...
When the exhaust is lean, the output of a zirconia oxygen sensor is below 450 mV. When the exhaust is lean, the output of a zirconia oxygen sensor is below 450 mV.
Video: Optic Nerve and Optic Disk Animation (Part 2 of 2)

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