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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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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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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

20,000 year old Arctic ground squirrel mummy 20,000 year old Arctic ground squirrel mummy
The Kingsley plantation, on Fort George Island in Jacksonville, Florida. Zephaniah Kingsley, the own The Kingsley plantation, on Fort George Island in Jacksonville, Florida. Zephaniah Kingsley, the own
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Special Triangles Special Triangles
Estimated number of new HIV infections per year over time period in Canada Estimated number of new HIV infections per year over time period in Canada
The treasurer of a union proposes changing the method of compounding interest on premium ... The treasurer of a union proposes changing the method of compounding interest on premium ...
Video: Hormonal regulation of pregnancy - weeks 2 through 38

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