"Think about the whole world of biological complex sciences. We still don't understand the way a protein folds the way it does."

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Mitt Romney was treated very unfairly. Mitt Romney didn't want to give his tax returns, because people don't understand returns that are complicated, and complex. And he didn't give it. He fought it, fought it, fought it, all the way into September. A month before the election, he gave his tax returns. And they picked out two items that were absolutely perfect. He did nothing wrong. And his returns are very much smaller than my returns.

— Donald Trump