France, a chemist named Pilatre de Rozier tested flammability hydrogen — Bill Bryson, A Short History Nearly Everything

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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.

Bill Bryson, A Short History of Nearly Everything

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