Gold

Newton was starting to make a pest of himself with his questions about the popular myth that the Face of Everyman knew the location of the fabled Philosopher’s stone.  The venerable sage did indeed possess the skills to transmute base metals into gold but he wasn’t about to share the secret with some simple minded guest at the Foggy Bottoms Resort and Spa.  Besides, his next batch of bullion wasn’t ready.  Hopefully the precious metals market wouldn’t peak before hand.