4 Pics 1 Word Puzzles

What is the 1 word (7 letters) answer to the puzzle below? Scroll down to see the answer!

4 Pics 1 Word Answer 7 letters for silver balls knocking, symbol of science with rings, magnets knocking each other, Einstein with theory on chalkboard

Balls, Science, Magnets, Einstein

The Answer is:

PHYSICS
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