TIL that the discovery of the jet stream in the 1920s was largely ignored by the scientific community (and thus unknown to the US military in World War II), mostly because Japanese meteorologist Wasaburo Oishi published his findings between 1923 and 1925 exclusively in the constructed language #Esperanto.

smithsonianmag.com/air-space-m…

Why Was the Discovery of the Jet Stream Mostly Ignored?

Maybe because it was published in Esperanto.

^{Rebecca Maksel (Smithsonian Magazine)}