Astrobiologist Graham Lau explores one of the most profound questions in science — what actually counts as life? In this clip, he shares how astrobiologists think about life beyond Earth and why our definitions may be too narrow. Could water itself hold the processes of life? Could there be living systems without cells, DNA, or anything we recognize as biology? Lau invites us to rethink what it means to be alive, how evolution might look on other worlds, and why life’s story on Earth is still full of mystery.
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