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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.
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.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.