There appears to be more Uranium 235 in the YWN Coffee Room in the last few weeks:
Definitions of moderator on the Web:
* any substance used to slow down neutrons in nuclear reactors
* in the Presbyterian church, the officer who presides over a synod or general assembly
* someone who presides over a forum or debate or coffee room
* someone who mediates disputes and attempts to avoid violence
wordnetweb.princeton.edu/perl/webwn
* In nuclear engineering, a neutron moderator is a medium which reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235.
en.wikipedia.org/wiki/Moderator_(Nuclear_Reactor)