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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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The longest a person has survived after a heart transplant is 24 years.