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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
A very high-resolution texture of the Moon, including a normal map