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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.
Did you know?
Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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There are 20 feet of blood vessels in each square inch of human skin.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Your heart beats over 36 million times a year.