https://www.sciencehistory.org/stories/magazine/the-high-flying-death-defying-discovery-of-helium/
The High-Flying, Death-Defying Discovery of Helium | Science History Institute
May 18, 2023 - During the War of 1870, astronomer Jules Janssen risked his life for scientific prestige and French patriotism.
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https://www.acs.org/education/whatischemistry/landmarks/heliumnaturalgas.html
Discovery of Helium in Natural Gas - National Historic Chemical Landmark - American Chemical Society
American Chemical Society: Chemistry for Life.
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