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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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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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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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