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Did you know?
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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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.