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There are 20 feet of blood vessels in each square inch of human skin.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.