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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?
There are more bacteria in your mouth than there are people in the world.
Did you know?
The human body produces and destroys 15 million blood cells every second.
Did you know?
There are approximately 3 million unintended pregnancies in the United States each year.
Did you know?
Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.