organic nuclear reactors
... that organic nuclear reactors, widely researched in the 1950s and 1960s, replaced the water normally used to cool the reactor core with various organic fluids?
... that <b id="mwBIw"><a href="./Organic_nuclear_reactor" id="mwBI0" rel="mw:WikiLink" title="Organic nuclear reactor">organic nuclear reactors</a></b>, widely researched in the 1950s and 1960s, replaced the water normally used to cool the reactor core with various organic fluids?