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Author Question: The bipolar junction transistor (BJT) is a current-controlled device. (Read 164 times) |
Approximately 500,000 babies are born each year in the United States to teenage mothers.
The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
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.
Excessive alcohol use costs the country approximately $235 billion every year.