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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.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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