By the beginning of the new year - I was just a few days short of the age of eighteen - I left for a university in Germany, Karlsruhe, that had an excellent reputation for chemistry. And I studied chemistry. I even worked on experiments, I even am proud of an experimental idea that I had. One of the jobs we had was to determine what salt was discovered- was dissolved in water; sodium chloride or potassium chloride or lithium chloride or cesium chloride - difficult. You pour in this and you get a precipitate and they all behave very similarly. But here I had a splendid idea. In a corner of the laboratory there was a spectroscope. And I took a drop of it and I did not see the yellow sodium line. I did see the red lithium line. And so I had the answer sooner than anybody else. But you might almost say, not with complete justice, that as an experimental chemist I did well, but only by cheating, to a small extent.