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Did you know?

In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Fate mapping during embryonic development. Fate mapping during embryonic development.
Indicators of Social Development Indicators of Social Development
Human Development and Remittances Human Development and Remittances
Share of Hours Worked by Education Level, 1940–2008 Share of Hours Worked by Education Level, 1940–2008
Cognitive Development of Children (4 of 4) Cognitive Development of Children (4 of 4)
Identification of the numbers in the Word Problem Identification of the numbers in the Word Problem
Video: Role of complement proteins

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