Watched by Fermi and Compton, the X-10 Graphite Reactor went critical on 4 November 1943 with about 30 short tons (27 t) of uranium.
Supervisado por Fermi e Compton, o reactor de grafito X-10 acadou o punto crítico o 4 de novembro de 1943 cunhas 30 toneladas de uranio.