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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.

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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

Mechanisms of Active and Passive Immunity Mechanisms of Active and Passive Immunity
On November 11, 1887, four anarchists were hanged in Chicago on charges that they had thrown a bomb On November 11, 1887, four anarchists were hanged in Chicago on charges that they had thrown a bomb
How difficult is it for children to learn to speak two languages? How difficult is it for children to learn to speak two languages?
Active Compared with Passive Voice Active Compared with Passive Voice
Turn the baby over and end with passive touch on the head. Gently hold the baby’s head and look ... Turn the baby over and end with passive touch on the head. Gently hold the baby’s head and look ...
Embryonic development of shepherd’s purse (Capsella), a eudicot Embryonic development of shepherd’s purse (Capsella), a eudicot
Video: Calvin cycle (The light-independent reactions )

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