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| 5. Technological Developments |
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(See 1913)| The major achievements in technology follow. | 1 |
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| a. Energy and Materials |
| 1921 |
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| Tetraethyl lead, gasoline antiknock additive, produced by Thomas Midgley (1889–1994). | 2 |
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| 1930–35 |
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| Development of first commercially practicable catalytic cracking system for petroleum by Eugene J. Houdry (1892–1962). | 3 |
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| 1930–37 |
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| Development of gas turbine unit for jet propulsion in aircraft by Frank Whittle. | 4 |
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| 1942 |
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| DAWN OF THE NUCLEAR AGE. The first self-sustaining nuclear chain reaction achieved at Stagg Field, Chicago, by Enrico Fermi (1901–54). The first full-scale use of nuclear fuel to produce electricity occurred at Calder Hall (England) in 1956. | 5 |
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