The Nuclear Regulatory Commission is conducting a special inspection at Constellation’s Quad Cities nuclear plant to review two events caused by battery issues. Neither event had any impact on public health or plant workers.

Ax man. Scram. Trip. Yes, this is Throwback Thursday, but no—we aren’t revisiting the slang of American countercultures from decades past. We are, however, pondering a term central to a very important day in nuclear history: December 2, 1942—the anniversary of controlled nuclear fission, first achieved with CP-1 at the University of Chicago.