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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.
The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
People about to have surgery must tell their health care providers about all supplements they take.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.