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APPENDIX century? The growing number of abduction reports is being used by a vocal segment of the UFO research community as further evidence that we are, in fact, being visited by extraterrestrial aliens, even if their origin has not yet been revealed. In the context of the present paper, a careful survey of the reported behavior of the alleged ufonauts argues exactly in the opposite direction. According to current UFO magazines and books, the number of reported and documented abductions is now measured in multiples of 249 instead of 23.5 degrees, seasonal weather changes would be intolerable to us: life would have had great difficulty in getting started, and humans would have evolved in very different ways. If the day was 100 hours long instead of 24 hours, mankind as we know it could not have evolved or survived at all. How, then, can we expect that extraterrestrial visitors from a com- pletely different planetary environment would not only resemble us, but breathe our air and walk normally on the earth? Even if, by some unknown principle of exobiology, the aliens did evolve naturally into the humanoid shape, wouldn't they modify their bodies using genetic engineering techniques to enhance their ability to work and survive in space, as humans may have to do over the next This last argument can be countered by assuming that our "Visitors" have precisely been created through such genetic manipulation into a form with which we can interact. But if that is the case, why not produce human specimens biologically indistinguishable from the earth's population? The ETH fails to give a convincing answer on this point. Even more intriguing is the observation that the reported "aliens" display recognizable human emotions such as puzzlement, interest, or amusement (as in the Betty Hill case of 1961 or the Valen- sole case of 1965). This suggests not only biological similarity, but extensive social acculturation. ABDUCTION REPORTS