He was of a generation which used "brains". Try it sometime!
He did not use any databases to come up with E=mc^2.
Einstein
Albert Einstein
Albert Einstein
Albert Einstein
The formula is E=mc2.
Albert Einstein! :D
Experiments carried out so far confirm the formula.
The correct formula is E = mc2 (E equals m c squared) and it was coined by Albert Einstein.
E=mc² is a very important formula but it is not important that Albert Einstein found the formula, unless you happen to be personally interested in him as a character.
Energy
Albert Einstein created it.