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Did you know?
The longest a person has survived after a heart transplant is 24 years.
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 more nerve cells in one human brain than there are stars in the Milky Way.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.