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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
Did you know?
The human body produces and destroys 15 million blood cells every second.
Did you know?
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
Did you know?
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

