Famous physicists real of fictional

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Across
  1. 1. Had a computer speak for him.
  2. 3. Found Radium which killed her.
  3. 5. Greek physicist who calculated Pi
  4. 8. E=MC squared.
Down
  1. 2. Father of modern physics.
  2. 4. Discovered Gravity. Real
  3. 6. theoretical physicists of Caltech,he's not crazy, but often appears that way. Fictional.
  4. 7. Developed the theory of superfluids, helped develop the atomic bomb