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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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