Assertion: fission | /r/CapableOf | explain in january
Facets:
value: by lise meitner
type: OTHER
value: by her nephew
type: OTHER
value: theoretically
type: MANNER
Source sentences:
text: Nuclear fission was discovered by Otto Hahn and Fritz Strassmann in December 1938 and explained theoretically in January 1939 by Lise Meitner and her nephew Otto Robert Frisch.