“It's really changed my view of what life is. So many of the things that we attribute to the trappings of life look like requirements, like oxygen and sunlight. All the things that humans would absolutely die without — they’re not really necessary for life. Studying these things sort of breaks down what is necessary; what are the things that life has to have?”

Karen G. Lloyd is the Wrigley Chair in Environmental Studies and Professor of Earth Sciences at the University of Southern California. Her work has appeared in leading publications such as Nature and Science. She is the author of Intraterrestrials: Discovering the Strangest Life on Earth.

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