If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.