““Greatest engineering achievements of 20th century ranked by National Academy of Engineering: 1. Electrification 2. Automobile 3. Airplane 4. Water supply and distribution 5. Electronics 6. Radio and Television 7. Mechanization of agriculture 8. Computers 9. The telephone system 10. Air-Conditioning and Refrigeration 11. Highways 12. Spacecraft 13. The Internet 14. Imaging 15. Household appliances 16. Health technologies 17. Petroleum and Petrochemical Technologies 18. Lasers and Fiber-optics 19. Nuclear technologies 20. High performance materials””