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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.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

Stuffed Jackalope in restaurant near Death Valley Stuffed Jackalope in restaurant near Death Valley
Variations on a theme: archaic Homo sapiens, Neandertal, and anatomically modern Homo sapiens skulls Variations on a theme: archaic Homo sapiens, Neandertal, and anatomically modern Homo sapiens skulls
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By age 3, children develop scripts for common events such as eating at a restaurant. By age 3, children develop scripts for common events such as eating at a restaurant.
If 0.40 mol of NaN3 reacts completely in the reaction shown below, then ________ L of N2 will ... If 0.40 mol of NaN3 reacts completely in the reaction shown below, then ________ L of N2 will ...
Video: Allergic Rhinitis

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