Markuu weerarkii Pearl Harbor keenay Mareykanka dagaalkii, Feynman waxaa qortay Robert R. Wilson, oo ka shaqeynayay sidii loo soo saari lahaa uranium la xoojiyay si loogu isticmaalo bamka atomiga, qayb ka mid ah waxa noqon lahaa Mashruuca Manhattan. Kooxda Wilson ee Princeton waxay ka shaqeynayeen aalad la yiraahdo isotron, oo loogu talagalay in si elektromagnetic ah loo kala saaro uranium-235 iyo uranium-238. Tan waxaa loo sameeyay qaab aad uga duwan kii loo adeegsaday calutron-ka oo ay soo saareen koox ka hoosaysa Wilson's mentor, Ernest O. Lawrence, oo ka tirsan shaybaarka Radiation Laboratory ee California.
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