Life's Edge is a book about the search for what it means to be alive. Carl really wanted to know why can't we define life? And they kept sort of gnawing on me, and then I realized that before I knew it, I got pulled into this vortex. That vortex became a book. It's called Life's Edge.
For every definition of life, there’s a creature that sends us right back to the drawing board.
This is the third episode in our three-part series, Origins, about the beginnings and boundaries of life on Earth.
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