Technological Breakthroughs of the 20th Century

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Across
  1. 2. – Automated assembly line
  2. 4. – Television broadcast inventor
  3. 8. – Theory of relativity
  4. 11. – Early internet
  5. 13. – Integrated circuit inventor
  6. 14. – First human in space
  7. 15. – Jet engine pioneer
Down
  1. 1. – Mobile phone inventor
  2. 3. – First heart transplant
  3. 5. – First artificial satellite
  4. 6. – Nuclear power discovery
  5. 7. – Supersonic passenger jet
  6. 9. – Polio vaccine creator
  7. 10. – First computer
  8. 12. – Penicillin discoverer