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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
Blood is approximately twice as thick as water because of the cells and other components found in it.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.


