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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

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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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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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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

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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.

Interaction between a regulatory protein and its target Interaction between a regulatory protein and its target
Looking at Cells Looking at Cells
Structural hierarchy in the molecular organization of cells Structural hierarchy in the molecular organization of cells
The fight against breast cancer. The fight against breast cancer.
Some of the many small molecules found in cells Some of the many small molecules found in cells
An X-ray image of lung cancer. An X-ray image of lung cancer.
Video: Brain Lobes Animation

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