Scientists, inventors and mathematicians
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- G. H. HardyBritish mathematician (1877–1947)
- GalenGreek physician, surgeon, and philosopher (c. 129–216 AD)
- Gaspard MongeFrench mathematician (1746–1818)
- Generation of AnimalsWork by Aristotle
- Geographical zoneMajor regions of Earth's surface demarcated by latitude
- Georg CantorMathematician (1845–1918)
- Georg OhmGerman mathematician and physicist (1789–1854)
- George BooleEnglish mathematician and philosopher (1815–1864)
- George D. LeMaitreGeorge DeCesare LeMaitre (December 6, 1933 – July 19, 2018) was a Massachusetts-based vasc
- George EastmanAmerican entrepreneur, inventor, and photographer (1854–1932)
- George Hall (bishop of Chester)George Hall (c. 1613–1668) was an English bishop.
- George Hudleston Hurlstone HardyGeorge Hudleston Hurlstone Hardy (14 August 1882 – 9 January 1966) was an entomologist who
- George StephensonEnglish mechanical and civil engineer (1781–1848)
- George Washington CarverAmerican botanist and inventor (1864–1943)
- Georges CuvierFrench paleontologist (1769–1832)
- Georges LemaîtreBelgian scientist and Catholic priest (1894–1966)
- Georges Lemaître ATVThe Georges Lemaître ATV, or Automated Transfer Vehicle 5 (ATV-5), was a European uncrewed
- Gerolamo CardanoItalian Renaissance polymath (1501–1576)
- Gibbons–Hawking spaceIn mathematical physics, a Gibbons–Hawking space, named after Gary Gibbons and Stephen Haw
- Gibbs–Donnan effectThe Gibbs–Donnan effect (also known as the Donnan's effect, Donnan law, Donnan equilibrium
- Gilbert N. LewisAmerican physical chemist (1875–1946)
- Giovanni Battista BeccariaGiovanni Battista Beccaria FRS (Italian: ; 3 October 1716 – 27 May 1781) was an Italian ph
- Giovanni Rossi LomanitzGiovanni Rossi Lomanitz (10 October 1921 – 31 December 2002) was an American physicist.
- Glenn Allan MillikanGlenn Allan Millikan (May 23, 1906 – May 25, 1947) was an American physiologist, inventor
- Gottfried Wilhelm LeibnizGerman polymath (1646–1716)
- Gottlob FregeGerman philosopher, logician, and mathematician (1848–1925)
- Gottlob FrickGottlob Frick (28 July 1906 – 18 August 1994) was a German operatic bass. He was known for
- Grace HopperU.S. naval officer and computer scientist (1906–1992)
- Grace Hopper (submarine communications cable)Grace Hopper is a private transatlantic communications cable that connects the United Stat
- Graham FairchildAlexander Graham Bell Fairchild (August 17, 1906 – February 10, 1994) was an American ento
- GreenockTown in Inverclyde, Scotland
- Gregor MendelAustrian biologist and friar (1822–1884)
- Guglielmo MarconiItalian electrical engineer and inventor (1874–1937)
- Gustav KirchhoffGerman physicist and mathematician (1824–1887)
- Gustave EiffelFrench civil engineer (1832–1923)