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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The average adult has about 21 square feet of skin.