So there's a compilation of science fiction short stories I had when I was a kid that I lost and can't remember the name of, nor any of the names of the stories or authors. I just remember some plot fragments, probably incorrectly. Overmind, please help me remember and find this stuff. I probably read it around 1981-1982, so the stories would date from before that -- probably from the 70s.
Plot fragment #1: Some guy finds another guy (maybe named Aldus) with an apparent mental age of 7 who lives/hangs out in a junkyard -- except Aldus somehow cobbles together a device from junkyard parts that glows and can mysteriously levitate. However, something pisses Aldus off, so he takes it apart before anybody can figure out how he has done it. All he ever says, softly, is "Whee!"
Plot fragment #2: A guy lives and works in a line of people who are all passing building stones down the line to one another, bucket-brigade style. He has always lived and worked in this line. He has nictitating membranes. He notes to a coworker that the bones of their ancestors were visibly different. I'm not sure we ever find out what these generations of people are building.
Plot fragment #3: A bum in poor health eats something that he thinks is food. It isn't; it's a teleportation device, and he manages to turn it on with one of his remaining teeth on its way down. He becomes ravenously hungry and can eat giant, impossible quantities of food (he might win a hard-boiled egg eating contest, but maybe that was only in Cool Hand Luke). Also, his health improves. Then, whoever is on the other end of the teleportation device decides they have enough of what he is sending, and they start sending other stuff back.