“In France, a chemist named Pilatre de Rozier tested the flammability of hydrogen by gulping a mouthful and blowing across an open flame, proving at a stroke that hydrogen is indeed explosively combustible and that eyebrows are not necessarily a permanent feature of one's face.”
Page 53
A Short History of Nearly Everything (2003)
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Address to the United Nations, New York City (September 18, 1959), as reported by The New York Times (September 19, 1959), p. 8. The physicist quoted was eventually found to be William Davidon, associate physicist at Argonne National Laboratory, Lemont, Illinois.

“The two most common elements in the universe are hydrogen and stupidity.”
Introduction to Blast Off : Rockets, Robots, Ray Guns, and Rarities from the Golden Age of Space Toys (2001) by S. Mark Young, Steve Duin, Mike Richardson, p. 6; the quote on hydrogen and stupidity is said to have originated with an essay of his in the 1960s, and is often misattributed to Frank Zappa, who made similar remarks in The Real Frank Zappa Book (1989): "Some scientists claim that hydrogen, because it is so plentiful, is the basic building block of the universe. I dispute that. I say there is more stupidity than hydrogen, and that is the basic building block of the universe."
Context: NO ONE GETS OUT OF CHILDHOOD ALIVE. It's not the first time I've said that. But among the few worthy bon mots I've gotten off in sixty-seven years, that and possibly one other may be the only considerations eligible for carving on my tombstone. (The other one is the one entrepreneurs have misappropriated to emboss on buttons and bumper stickers: The two most common elements in the universe are hydrogen and stupidity.
(I don't so much mind that they pirated it, but what does honk me off is that they never get it right. They render it dull and imbecile by phrasing it thus: "The two most common things in the universe are..."
(Not things, you insensate gobbets of ambulatory giraffe dung, elements! Elements is funny, things is imprecise and semi-guttural. Things! Geezus, when will the goyim learn they don't know how to tell a joke.

“The two most common elements in the world are hydrogen and stupidity.”

Source: The Real Frank Zappa Book (1989), p. 239; this may be derived from a similar observation by Harlan Ellison which is sometimes misattributed to Zappa: "The two most common elements in the universe are hydrogen and stupidity."

“There is more stupidity than hydrogen in the universe, and it has a longer shelf life.”

Quoted in The world of Andrei Sakharov: a Russian physicist's path to freedom (2005) By Gennadiĭ Efimovich Gorelik, Antonina W. Bouis, p. 134.