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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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The human body produces and destroys 15 million blood cells every second.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.