", a first-year student of physics like Fermi, was not a usual person; his main interest was directed to that part of the world which is not made of human beings. ... ... He had organized a group of students among whom Fermi was prominent in an "Anti-Neighbors Society." The society's single aim was to pester people. The tricks they played ranged from placing a pan of water on a door left ajar which would give a shower to the first person going through, to exploding a in a classroom during a solemn lecture. For the latter prank Rasetti and Fermi, who had built the bomb, risked being expelled forever from the university. They were saved by their teacher of experimental physics, Professor , a tolerant man with keen judgment, who stressed their scholarly achievements at an especially convoked disciplinary meeting of the faculty."