i have a few questions about both of these theorys that Einstein wrote. 1. Was one of these theorys tested against 2 atomic clocks, one which is on earth and the other on a fast jet going around the earth, both clocks syncronised and the results were different, which theory was tested with this? 2. E=MC2 vs E=MC3. would the laws of physics change if we had a formula E=MC3?.Would E=MC3not work due to that the tests of this formula would not be proved properly? Am i talking Theorectial Physics here lol? 3. I am aware that there are other formulas other than Einsteins one, i was thinking are all the laws of physics based on Einsteins Special and General Theory of Relativity? because the laws would have to have a base of some sort? do we base these laws from einsteins theorys to come up with new formulas to work out specific solutions to problems involving physics?