Assertion: astatine | /r/CreatedBy | dale r. corson
Facets:
Source sentences:
text: Astatine was first produced by Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segrè in 1940.
text: Astatine was first produced by Dale R. Corson, Kenneth Ross MacKenzie, and Emilio Segrè in the University of California, Berkeley in 1940.