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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.
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.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%