Assertion: gunpowder | /r/HasProperty | hidden in the text
Facets:
Source sentences:
text: In the early 20th century, a British artillery officer proposed that another work tentatively attributed to Bacon, Epistola de Secretis Operibus Artis et Naturae, et de Nullitate Magiae, also known as Opus Minor, dated to 1247, contained an encrypted formula for gunpowder hidden in the text.