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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.

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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Menstrual cycle summary based on a 28-day (average) menstrual cycle. Menstrual cycle summary based on a 28-day (average) menstrual cycle.
The effective temperature, or black body temperature, of the Sun (5777 K) is the temperature a black The effective temperature, or black body temperature, of the Sun (5777 K) is the temperature a black
Trichromatic Theory of Color Vision Trichromatic Theory of Color Vision
How lateral inhibition produces contrast enhancement. (Based on Ratliff, 1972.) How lateral inhibition produces contrast enhancement. (Based on Ratliff, 1972.)
Foundations of evidence-based practice. Foundations of evidence-based practice.
E chart for testing distant vision E chart for testing distant vision
Video: Exercise and cardiac output

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