Assertion: gunpowder's use | /r/HasProperty | known arab scientist
Facets:
value: well
type: DEGREE
Source sentences:
text: my citation of Needham is correct you might have another print of the book and the print i cited goes under "Alchemy and Chemistry" not "The Gunpowder Epic", and you can see that my citation is compatiple with google books version. and lets say that Needham is completely ignorant of the use of saltpeter in the Arab World for example the well known Arab scientist Jabir ibn Hayyan (722-815) have invented nitric acid he synthesized it from Potassium Nitrate (saltpeter) also