In the tradition of the old "Ace Doubles" two-in-one books (flip one over to read the second title)--here is the fifteenth Wildside Double: HUMAN IN THE CIRCUIT: Collected Stories, by Howard V. Hendrix. An astronaut with suicidal tendences from having spent too much time in suspended animation. Machine descendants of human technology, trying to understand what their creators were thinking. Virtual and atomic spins on apocalypse. Mystics (one Martian, one mathematician) who succeed by failing and fail by succeeding. Cutting-edge science fiction by a modern master. PERCEPTION OF DEPTH: Collected Stories, by Howard V. Hendrix. A plausibly mad "mushroom messiah" and a lost tribe--soon to be more lost than ever as humanity's first ambassadors to the stars. Three fighter pilots on a secret mission involving the Roswell cover story's surprising truth. An early astronomer discovers the macrocosm of which our universe is just a part. A trip backwards from 1999 to the 1939 World's Fair, and a meeting with Einstein. More strange yet compelling characters encountering the challenges of a technological world.