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The human body produces and destroys 15 million blood cells every second.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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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.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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Vaccines prevent between 2.5 and 4 million deaths every year.