Proven biology and tests
There are a very few souls here on earth that claim a biological difference from humans. On the face of it this should be the easiest to prove - the biological requirements for species are fairly well defined. Life is rarely that simple and the existence of a subspecies that can occasionally interbreed with humans is at least somewhat plausible. Those that claim this tend to posit an initial technical, magical or deity intervention for the initial pairing. Thus the most frequent (if such a term can be used for such a small sample) such claims are for some form of elves (generally Tuatha de Danaan or Sidhe - for which there is some support in ancient texts), angels (for which there is some biblical support) or oriental dragons. Possible encounteres (including those unsupported claims made that were not utterly impossible) have been explainable variations and mutations of homo sapiens and unprovable without extensive DNA testing. (For which, if anyone ever volunteers an appropriate lab, the
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CFi is working to urge Members of Congress and policy makers to support a serious, independent scientific research effort and to seek release of still-secret government documents. Achieving scientific, congressional and media credibility for the study of unexplained aerial phenomena while working for the release of official information and physical evidence.