Assertion: actinium | /r/HasProperty | discovered
Facets:
Source sentences:
text: Actinium was discovered a second time in 1902.
text: Actinium was discovered and first isolated by Friedrich Oskar Giesel in 1902.
text: Actinium was discovered a second time in 1902.
text: Actinium was discovered in
text: When was actinium discovered?
text: Friedrick did not realize that actinium has already been discovered.
text: Actinium was discovered a second time in 1902.