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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Did you know?
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
Did you know?
Approximately 500,000 babies are born each year in the United States to teenage mothers.