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When I was a kid, my brother and I loved playing with toy dinosaurs. I’d let my brother take the ever-popular T. Rex while I went for the stegosaurus. Its back plates and tail spikes were cool, but it was this dinosaur’s second brain that put it over the top for me. I think I intuited at an early age that two brains are a good idea in the scheme of things. Frankly, in the years since, I’ve often suspected that my tongue has a brain of its own.