Assertion: borax's boron | /r/HasProperty | discovered by louis-jaques thénard
Facets:
value: in 1808
type: TEMPORAL
Source sentences:
text: Boron was discovered by Joseph-Louis Gay-Lussac and Louis-Jaques Thénard, French chemists, and independently by Sir Humphry Davy, an English chemist, in 1808.