By the clue.
A theory is something they think is true and a law is something that has be proven to be true
The Pareto principle
Robert hook, Matthais Schleiden, Rudolf Virchow, and Theodor Schwann. I don't know the fifth one.
einsteen's theory of relativity [1905] extended maths to cover objects moving at a constant high speed.His general theory of relativity [1916]further extended the maths to cover rapidly accelerating...