There’s no single ‘smoking gun’ for life beyond Earth. Microbiologist Peter Girguis explains the subtle fingerprints scientists hunt for—and why finding them on Mars could change everything.

For more, check out the <a href="https://www.wgbh.org/podcasts/particles-of-thought/extended-interview-extremophiles-the-deep-sea-and-alien-life-with-peter-girguis">extended interview</a> with Peter Girguis.

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A Black Hole Is a Place, Not a Thing | Janna Levin

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