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People regularly feel that they can instinctively perceive whether something is alive, however nature is loaded up with elements that ridicule simple classification as life or non-life - and the test might escalate as different planets and moons open up to investigation. In this selection from his new book, Life's Edge: The Search for What It Means to Be Alive, distributed today, the science author Carl Zimmer talks about researchers' disappointed endeavors to foster a general meaning of life. "It is normally said," the researchers Frances Westall and André Brack wrote in 2018, "that there are however many meanings of life as there are individuals attempting to characterize it." free dating sites in usa without payment how long does tylenol take to work how long does it take for tylenol to work As an onlooker of science and of researchers, I find this conduct odd. Maybe space experts continued to concoct better approaches to characterize stars. I once asked ...