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The human body produces and destroys 15 million blood cells every second.
There are more sensory neurons in the tongue than in any other part of the body.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.