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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

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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.

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Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

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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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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

The energy input and output of glycolysis. The energy input and output of glycolysis.
Nap master (fixed) Nap master (fixed)
Should We Prolong Life at all Costs? Should We Prolong Life at all Costs?
U.S. Subsurface Coal Mining: Output, Price, and Output per Worker-Hour, 1949–1994 U.S. Subsurface Coal Mining: Output, Price, and Output per Worker-Hour, 1949–1994
Role of Productivity in Determining Output per Worker, 2009 Role of Productivity in Determining Output per Worker, 2009
Possible Sources of Differences in Output per Worker Possible Sources of Differences in Output per Worker
Video: Major Elements in Biological Molecules: Proteins

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