It has become apparent that we are not alone, multi dimensioned earths with different histories and physical realities exist along side our own. The best and the brightest when sent travelling to these strange worlds come back quivering wrecks. What's needed are the loose and dysfunctional who are not likely to be phased by the physical and social disparities between our reality and those experience elsewhere. Our hero is just such an individual. The story becomes more involved as a least one other world sends an agent to explore our world. The plot I cannot remember, but I suspect a race against time to establish peace and understanding before the panicked straights demolished the cosmos. I read this in the late sixties, it was for young adults and I would appreciate any help in finding it. Thanks, Ian