Milton Sirotta, the 9-year-old nephew of Edward Kasner, a professor at Barnard College of Columbia University in New York, invented the name Googol (10^100) and then the name Googolplex (10^Googol). A Googolplex is such a large number that if you tried to write it out in “Arial 10,” it wouldn’t fit in the visible universe, which is “only” 10^27m. (Incidentally, writing it out in a different font wouldn’t make much difference…)
