Why was Roger Bacon called Doctor Mirabilis?

Roger Bacon was an English philosopher and Franciscan monk who promoted experimental science and was deeply interested in the study of nature.

      He studied mathematics, astronomy, optics, alchemy and languages. His studies on the nature of light, and on rainbows, are especially noteworthy, and he seems to have planned and interpreted these experiments carefully.

     He seriously studied the problem of flying in a machine with flapping wings. He was also the first person in the West to give exact directions for making gun-powder.

     Roger Bacon’s work was talked about everywhere, and eventually won him a place in popular literature as a kind of wonder worker. He was also called Doctor Mirabilis- ‘mirabilis’ in Latin means ‘wonderful teacher.’