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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.
The horizontal fraction bar was introduced by the Arabs.
If you could remove all of your skin, it would weigh up to 5 pounds.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
The average office desk has 400 times more bacteria on it than a toilet.
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