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Did you know?
There are 60,000 miles of blood vessels in every adult human.
Did you know?
It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
Did you know?
The human body produces and destroys 15 million blood cells every second.
Did you know?
Blood is approximately twice as thick as water because of the cells and other components found in it.
Did you know?
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.