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Did you know?
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Did you know?
Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

