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A Shadow Biosphere
Could there be aliens here on Earth? While this question tends to bring out tales of UFOs and bug-eyed interstellar voyagers, it is not considered a bizarre urban legend by some astrobiologists. By "alien" they don't mean "coming from beyond Earth," they mean "other" –- other forms of DNA, other amino acids used to build proteins, any other means by which the chemistry of early Earth could have combined to form life we're not familiar with. If there are forms of life on Earth today with a biochemistry not like our own, how would we even know it?
(Via The Anomalist.)
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