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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.