Mathematical Hero of his age

Johannes Kepler

Involvement in Infinitesimal

Johannes was one of the founding fathers of this great discovery. Infinitesimal is the expression of the idea of objects being so small you can not measure them. It is an object so small that you can't use any feasible measurement to measure it, and that it is slightly bigger then zero.
With out this discovery we wouldn't know about viruses, atoms, cells, ect. With out it we probably wouldn't have life spans of 70 years and greater.