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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.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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.
The familiar sounds of your heart are made by the heart's valves as they open and close.