health.howstuffworks.com

nWam9 TIL in 1962 there was a serious laughing epidemic in Tanzania that spread across towns and caused people to laugh uncontrollably. It lasted for several months.
d8gpE TIL about Osteo-Odonto-Keratoprothesis where you implant part of your tooth in your blind eye to restore sight
awbro TIL: That leeches are still used in modern medicine.