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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.