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" ... Kelley: Okay, so I’m going to have a seat here and just kind of have a conversation with you. Really, we’ve been exploring the boundaries between synthetic and biological world for almost two hundred years. So when Friedrich Wöhler turned ammonium cyanate, which is an inorganic salt, into urea, which is a natural compound produced by the kidneys, he basically set the stage for the question of what is life and where is the boundary between an inorganic molecule and something that is alive. ... "