The first successful artificial heart implant

On April 4, 1969, Dr. Denton Cooley, a Houston heart surgeon, performed the first successful artificial heart implant on a human patient. The artificial heart was actually developed by Cooley's cross-town rival and former colleague, Dr. Michael DeBakey, and his team. Cooley's implant operation turned the rivalry with DeBakey into a full-fledged feud that lasted for the next 40 years. DeBakey considered it a betrayal and a theft of his technology.

Father of British Neurology

John Hughlings Jackson who is known as the father of British neurology was born April 4, 1835, who studies of epilepsy, speech defects, and nervous-system disorders arising from injury to the brain and spinal cord helped to define modern neurology. He died Oct. 7, 1911.