Yttralox
... that Yttralox, a transparent ceramic, was accidentally discovered in the course of fuel cell research in the mid-1960s?
... that <b id="mwBT0"><a href="./Yttralox" id="mwBT4" rel="mw:WikiLink" title="Yttralox">Yttralox</a></b>, a <a href="./Transparent_ceramics" id="mwBT8" rel="mw:WikiLink" title="Transparent ceramics">transparent ceramic</a>, was accidentally discovered in the course of fuel cell research in the mid-1960s?