In one of Niven's rare stories of cross-dimensional travel, an unnamed protagonist discovers the real reason that things seem so foggy on a foggy night.

This early Niven story was the first of many to delve deeply into the legal and ethical implications of organ-transplant technology. It introduces Known Space's organ banks and the breed of criminals known as "organleggers".

The tragic story of the first manned expedition to Pluto, and the fate of the surviving astronaut who finds a unique way to prolong his lifespan in hopes of rescue.

Detective-Lieutenant Gene Trimble faces an increasing number of bizarre suicides in a world struggling to come to terms with its place in a multiverse of different timelines, where every decision ever made by anyone becomes an alternate universe.

Eric is the "Brain" of the first ship to explore Venus. Howie is his human crewmember. When a fault develops, forcing the ship down onto the hostile Venusian surface, Howie must figure out the problem with Eric, be it mechanical or psychological. Becalmed in Hell first appeared in Fantasy and Science Fiction in July 1965.