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Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
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?
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
Did you know?
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.