But he doesn’t have a theory for how it occurred. Put us inside that moment and explain how the image of the tree of life has altered over the centuries.ĭarwin is home from the voyage of The Beagle, a young man living in London, and thinks that perhaps species have evolved over time. Your book opens with Charles Darwin making a little sketch in a notebook. When National Geographic caught up with the author at his home in Montana, he explained how the discovery of a new “third kingdom” of life changed our understanding of evolution, how so-called kissing bugs can move DNA from one species to another, and why the gene-editing tool CRISPR presents exciting new possibilities, as well as ethical challenges. But as David Quammen, a National Geographic contributing writer, explains in his new book The Tangled Tree, new discoveries in human biology in the last few decades have led scientists to radically alter the story of the origins of life, with powerful implications for our health-and even our very nature. Until recently, the central tenets of Darwin’s theory of evolution, from how heredity works to the gradual variation in species, had been regarded as settled and beyond challenge.
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