Rhazes was fond of music since his childhood, then studied philosophy and wrote several books about it. Later on he indulged himself in the study of chemistry and medicine. After finishing his studies, Rhazes went back to his home town and practised medicine and soon became very famous. He wrote more than 224 books on various subjects. His most important work is the medical encyclopaedia "continens" (Al-Hawi) which greatly effected the human civilization specially in Europe.