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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.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.