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Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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About 60% of newborn infants in the United States are jaundiced; that is, they look yellow. Kernicterus is a form of brain damage caused by excessive jaundice. When babies begin to be affected by excessive jaundice and begin to have brain damage, they become excessively lethargic.

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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

Members of the Lemba ethnic group from southern Africa. Members of the Lemba ethnic group from southern Africa.
Many European Americans are involved in ethnic work, attempting to maintain an identity more precise ... Many European Americans are involved in ethnic work, attempting to maintain an identity more precise ...
U.S. Racial-Ethnic Groups U.S. Racial-Ethnic Groups
Projections of the Racial-Ethnic Makeup of the U.S. Population Projections of the Racial-Ethnic Makeup of the U.S. Population
Ethnic and Religious Diversity Ethnic and Religious Diversity
Ethnic Tensions Ethnic Tensions
Video: Protein catabolism (Krebs cycle) and Protein anabolism (protein synthesis)

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