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The average adult has about 21 square feet of skin.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
There are 60,000 miles of blood vessels in every adult human.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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