Assertion: gunpowder | /r/HasProperty | invented by chinese taoist alchemists
Facets:
value: at about 1000 a.d.
type: TEMPORAL
Source sentences:
text: Gunpowder was invented by Chinese Taoist alchemists at about 1000 A.D. when they tried to find a potion to gain human immortality by mixing elemental sulfur, charcoal, and saltpeter.