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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
Blood is approximately twice as thick as water because of the cells and other components found in it.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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.