Come on, people, get your facts straight:
> . . . I know Eisntein had three wives . . .
He had two wives.
> . . . he was kicked out of university, and his maths teachers told
> him he would account to nothing . . .
No, he did just fine in university and went straight to his Ph.D. with no problem. It was during the equivalent of high school that he didn’t do very well, and that was mostly because he was bored. He dropped out, moved to another country, re-enrolled in school, and did just fine. His teachers in high school knew that he was a genius, but they didn’t like him personally.
The usual opinion is that Newton was the greatest physicist of all time and Einstein is the second greatest. They were important because they unified the state of physics at the time they were working. Before Newton, physics was a mess. Scientists of the time were still trying to explain the cosmos as understood in the theories of Copernicus, Kepler, and Galileo using Aristotelian physics, and it just wasn’t working. Most of Newton’s major discoveries (the laws of force, the law of gravity, and calculus) worked together to create a new physics under which the Copernican/Keplerian/Galilean discoveries made sense.
Interestingly, the one major Newtonian discovery which didn’t fit into this system, the wave theory of light, proved to be the point at which Einstein was able to show the Newtonian system of physics wasn’t complete. In the nineteenth century, various physicists had shown that light (and other radiation) was related to electricity and magnetism. To make the equations of electro-magnetism work, it was necessary to have light have the same speed from any reference frame. Einstein’s synthesis was to show that special and general relativity made that work correctly. He was also part of a number of physicists who showed why it was necessary to take a quantum-mechanical view of physics on small scales.
Incidentally, Xavier, what’s the point of mixing questions about Einstein’s and Newton’s abilities as physicists with snide comments about their personal lives? It’s perfectly possible for someone to be a slimebag personally and yet an utter genius. Have you ever read a biography of either Einstein or Newton, or do you just collect snippets of (probably inaccurate) facts about genius’s lives so you can show your superiority to them?