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Did you know?
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.

