I want to know the answer to the following question:
What was the Water Boiler that Feyman worked on?
All the background I'm provided with is that "Feynman's other work at Los Alamos included calculating neutron equations for the Los Alamos "Water Boiler", a small nuclear reactor, to measure how close an assembly of fissile material was to criticality.". Is that enough to answer the question?
Answer: yes