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Did you know?

Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

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There are more sensory neurons in the tongue than in any other part of the body.

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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.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

White matter White matter
German and Irish Settlement in the Northeastern United States, 1870 German and Irish Settlement in the Northeastern United States, 1870
Leading Sites of New Cases of Cancer in the United States, 2013 Leading Sites of New Cases of Cancer in the United States, 2013
The three states of matter: solid, liquid, and gas. The three states of matter: solid, liquid, and gas.
Income Inequality in the United States: 1947–2009 Income Inequality in the United States: 1947–2009
Medial view of tracts revealed by removing gray matter from a midsagittal section Medial view of tracts revealed by removing gray matter from a midsagittal section
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