Sara Imari Walker on Aliens and the Origins of Life

The Michael Shermer Show # 456
A conversation with physicist and astrobiologist Sara Imari Walker.
What is life? This is among the most difficult open problems in science, right up there with the nature of consciousness and the existence of matter. All the definitions we have fall short. None help us understand how life originates or the full range of possibilities for what life on other planets might look like.
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