What if you constantly change the ingredients in your raw batter, but the baked cake is always lemon? It sounds like something from a surrealist film, but equivalent scenarios seem to play out all the time in the mathematics of the quantum world. Nobel prizewinner Frank Wilczek and colleague Alfred Shapere say we can't ignore the absurdity of the situation any longer. It's time to get to the bottom of what is really going on, and in the process cement our understanding of the fundamental nature of the universe.
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