Science and technology in the 20th century

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Across
  1. 4. Isolation of insulin
  2. 5. Wi-Fi
  3. 8. Xerography (photocopying)
  4. 10. Heart-lung machine
  5. 11. Charge of an electron
  6. 13. Nylon
  7. 17. Polio vaccine
  8. 18. Big bang theory
  9. 19. Double helix of DNA (1)
  10. 21. Blood types
  11. 22. Airplane
Down
  1. 1. Double helix of DNA (2)
  2. 2. Special theory of relativity
  3. 3. Television
  4. 6. Microwave
  5. 7. Molecular dipole
  6. 9. Cloning (Dolly the sheep)
  7. 12. Electric refrigerator
  8. 14. Magnitude scale of earthquakes
  9. 15. Radiation of black holes
  10. 16. Transistor
  11. 20. Model of the atom