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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.