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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.