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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
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.