sentences:  Crewe saw ways in which it would be possible to improve the images important to that work.He came up with a design for a scanning electron microscope and set up a group at Argonne to build it, getting it to function in 1963.This work became so interesting to Crewe that in 1967 he decided to leave Argonne and return to the university’s physics faculty, which had granted him a full professorship in 1963.