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There are more bacteria in your mouth than there are people in the world.
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.
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.
Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

