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There are 60,000 miles of blood vessels in every adult human.

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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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