John tried to decide what and who to change. He finally settled on the other male teachers, including the principal.
First, he made them all younger. John was 28 years old and there was probably only 1 guy teacher younger than him: the science teacher, Hank, who was new and only 22, fresh from college. The other three, plus Principal Matthews, were all old guys in their 50s and 60s.
John programmed the Chronivac to unage them by 30 or 40 years, until they were all younger than him. The principal had the most dramatic change. John changed his history so that he was one of the smartest people ever, graduating college at age 8, teaching for 6 years here, and then becoming principal at age 14. Now at 18 he was still the youngest principal in America.
John then decided to make the other men, including himself, 10 years younger. Now the school was a school for boys who were of genius intellect and great athleticism, which was why John made all of the now teenage teachers strong athletes. Young Matthews was now a bodybuilder, much like John himself now.
John saw that the female teachers had vanished. Well, he thought, it is a boy's school now.