4 Pics 1 Word Puzzles

What is the 1 word (6 letters) answer to the puzzle below? Scroll down to see the answer!

4 Pics 1 Word Answer 6 letters for Einstein idea of relativity e=mc2, man evolving from chimp, man with idea lightbulb, math problems in red apple with green leaf

E=MC2, Evolution, Idea, Math

The Answer is:

THEORY
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