Periodic Table
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“Oh, I carry a periodic table in my wallet. I love it very much. It stands for order, stability – but it also stands for imagination and mystery. And some of the elements get very, very complicated, as you go above 92 and sort of relativistic and other considerations come in. For example, you cannot understand, on the basis of the periodic table, why gold is gold. It’s a very simple question. In fact, it turns out to be a very deep question. And I am not mathematical enough to tell you the answer. But it involves both quantum physics and relativity.”