“Mix together saltpetre, luru vopo vir con utriet [powdered charcoal], and sulphur, and you will make thunder and lightning, if you know the method of mixing them.”

—  Roger Bacon

Source: De Secretis Operibus Artis et Naturae et de Nullitate Magise, Ch. 11, in a reference to Bacon's knowledge of making gunpowder, as quoted by Thomas Thomson, The History of Chemistry (1830) Vol. 1, p. 36.

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Roger Bacon 21
medieval philosopher and theologian 1220–1292

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