People often feel that they can intuitively recognize whether something is alive, but nature is filled with entities that flout easy categorization as life or non-life — and the challenge may ...
Definitions of "life" are a dime a dozen. In a paper published back in 2011, University of Haifa biophysicist Edward Trifonov documented 123 of them. But which one is best? Trifonov decided to seek ...
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