Mad Scientist's Puzzle

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Across
  1. 3. the smallest Antman can get
  2. 7. Au
  3. 8. a dwarf among gods
  4. 11. the physics building
  5. 13. 3*10^8 m/s
  6. 14. free of charge
  7. 15. number of earths that could fit in the sun
  8. 17. hottest planet
  9. 19. highest ranked physics and math grad school
  10. 20. always neglected
  11. 21. notoriously hard class
Down
  1. 1. first female laureate
  2. 2. the best science
  3. 4. Einstein's birth country
  4. 5. Fat Man’s favorite food
  5. 6. Fahrenheit is to Rankine as Celsius is to
  6. 9. needed to make rechargeable batteries
  7. 10. J. Robert
  8. 12. wave-particle
  9. 16. space agency
  10. 18. loved apples