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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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The human body produces and destroys 15 million blood cells every second.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.