As a further argument, Ford pointed out that a recently-published tree of life that was based on proteins that hadn't undergone horizontal gene transfer was built using only 31 proteins.

NPR's Scott Simon asks science writer David Quammen about horizontal gene transfer and how it changes how we think about humankind's place in the world. Quammen's new book is The Tangled Tree.

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The tree, back left, which fell on the house. Credit: Google The council's arborist rejected the application, saying the tree was in good health and condition, with no structural faults.

The paradise tree snake ( Chrysopelea paradisi ) Snakes wiggle their bodies to propel themselves on land or through water, but why certain flying snake species do so in the air was unclear.

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NPR's Scott Simon asks science writer David Quammen about horizontal gene transfer and how it changes how we think about humankind's place in the world. Quammen's new book is The Tangled Tree.