The living dead


By Duncan Graham-Rowe ANTS and infertile humans are not alive, but parasitic DNA is. That’s the view of a Polish researcher who has proposed a new, universal definition of life. He claims it will lay to rest arguments about what is and isn’t alive, and might offer insights into when life on Earth got started. And if we ever find something that looks like life on another planet, his definition could help us settle whether it’s alive or not. Bernard Korzeniewski of the Institute of Molecular Biology at Jagiellonian University in Kraków, Poland,
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