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Aliens may be living among us, but we do not know it because they are microbes that do not have the standard biochemistry of Earth-dwelling organisms.
As well as the many forms of life based on DNA that are known to science, the Earth may have been home to a second creation of organisms that make up an unremarked realm of “life as we don’t know it”, according to Paul Davies, of Arizona State University, a cosmologist and theorist of extraterrestrial life.