The CFX was a sub-critical assembly of uranium-2-35 surrounding a Cf-252 source. The function of the U-235 fuel was to multiply the neutrons coming from the Cf-252 source, which fissions spontaneously. The CFX was designed never to exceed a Keff of 0.99. The CFX assembly yielded sufficient neutron fluxes for applications such as neutron activation analysis.
Keff is the fission neutron multiplication ratio; 1 is criticality.
(a) I felt speed was far more important than readability (reasonable for rapid-fire short messages or constrained typing ability such as a flip phone, also a common way to imply "fuck you, my time is more important than yours" in longer forms such as email), or
(b) i'm 14 and e e cummings is so deep (blogs)