William T.G. Morton performed the first public demonstration of ether as a surgical anesthetic at Massachusetts General Hospital. Before this, surgery was a traumatizing ordeal of extreme pain, often requiring the patient to be restrained by several strong men. Anesthesia allowed surgeons to take their time, leading to more complex and successful operations. This invention changed the hospital from a place of dread and agony into a place of healing and scientific recovery, marking the birth of modern surgery.