Thomcat
11/13/2016
An unusual take on the effects of radiation on space travelers.
According to Harlan Ellison's intro in "Dangerous Visions", this is Samuel R. Delany's first short story - perhaps not counting the novella "Empire Star" from a year earlier.
I should also point out that two other short stories from this same year (The Star Pit and Driftglass) were nominated for a Hugo and a Nebula (respectively), along with this story which was nominated for both - winning the Nebula.