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The 'United States National Academy of Engineering' has produced a list of its top twenty engineering achievements of the century, ranging from electrification to developments in materials science. The basic guideline for inclusion in the list was whether or not an advancement had made a great contribution to the quality of life. (Even devices such as the airplane, invented in the 1800s, were eligible for the list if the judges felt that they had had a great impact on society in the 20th century.)
The entire list is as follows:

★ 1. Electrification

★ 2. Automobile

★ 3. Airplane

★ 4. Water supply and Distribution

★ 5. Electronics

★ 6. Radio and Television

★ 7. Mechanised agriculture

★ 8. Computers

★ 9. Telephone

★ 10. Air Conditioning and Refrigeration

★ 11. Highways

★ 12. Spacecraft

★ 13. Internet

★ 14. Imaging

★ 15. Household appliances

★ 16. Health Technologies

★ 17. Petroleum and Petrochemical Technologies

★ 18. Laser and Fiber Optics

★ 19. Nuclear technologies

★ 20. Materials science

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★ Greatest Achievements