Many things, one of which being the well known theory "E=MC^2". Another was the Refrigerator. And the Atomic Bomb (with some help I believe).
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I don't think he invented the Refrigerator - but he certainly did not invent the atomic bomb. He developed physics that helped others invent the weapon, but that was certainly not his intention.
Albert Einstein.
Albert Einstein
he invented science and become a scientist
albert Einstein
Albert Einstein
albert Einstein
Albert Einstein
Albert Einstein
He co-invented the refrigerator, he did not invent it.
albert einstein invented the equation E=mc2
Albert Einstein
Albert Einstein