I wanted to look up a little more on the introduction of modular arithmetic and Carl Gauss, who is started it. I got distracted as I was reading about him when I saw who some of his students were (even though he disliked teaching). They included Bernhard Riemann (Riemann integrals, anyone? Also did a great deal of work with geometry and higher dimensions), Richard Dedekind (Dedekind cuts, anyone? Did work in Abstract Algebra, Algebraic Number Theory, and with Dedekind cuts, he laid the foundation for real numbers), and Friedrich Bessel (an important astronomer). I think it's pretty cool how so many important mathematicians are related to one another (student-teacher, family, or friends).

Carl Gauss