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APPENDIX NEW In conclusion it is useful to speculate about several hypotheses that go beyond the initial scenarios summarized in Table I above and that do take into consideration with various degrees of success the five objec- tions we have reviewed. These new hypotheses should only be regarded as a means of stimulating discussion, not as formal proposals. 253 trips" to unknown landscapes. Sexual or genetic interaction is a com- mon theme in this body of folklore. PHYSICAL CONSIDERATIONS As witnesses become less reluctant in the reporting of their experiences, the notion that UFOs are "somebody else's spacecraft" (in the words of Stanton Friedman) with the implication of a technology powered by advanced propulsion systems, becomes less tenable and possibly less appealing scientifically than other notions. But the alternative explana- tions, notably the psychosociological hypothesis, also find themselves severely challenged. The phenomena to be explained include not only strange flying devices that are described as physical craft by the witnesses, but also objects and beings that exhibit the ability to appear and disappear very suddenly, to change their apparent shapes in continuous fashion and to merge with other physical objects. Such reports seem absurd in terms of ordinary physics because they suggest a mastery of time and space that our own physical research cannot duplicate today. If these sightings can be confirmed either by direct observation, by photographic evi- dence, or by the weight of statistics, they may, however, represent an opportunity to test new concepts of physical reality at a time when many theoreticians are grappling with the possible existence of N-di- mensional universes, with N greater than four. HYPOTHESES One such line of speculation has been advanced by Devereux (10),