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Asthma cases in Americans are about 75% higher today than they were in 1980.
The average adult has about 21 square feet of skin.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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