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The key to the Feynman Drive is a submicroscopic sample of the hypothetical element Feynmanium, named after my real-life mentor and co-author from my Caltech days.
Feynmanium (symbol Fy) is informally used for a hypothetical chemical element of atomic number 137, which has not been observed to occur naturally, nor has been synthesized, nor is it known if this element is physically possible.