Assertion: plutonium | /r/HasProperty | prepared by a team of researchers
Facets:
value: artificially
type: MANNER
Source sentences:
text: Plutonium was first prepared artificially by a team of researchers at the University of California at Berkeley (UCB) in 1941.
text: Plutonium was first prepared artificially by a team of researchers at the University of California at Berkeley (UCB) in 1941.