So this is a very early Robert A Heinlein novel, but one that I also really liked. So apparently it was first serialized in 1941, but this full edition probably went through a lot of editing and rewrites for its publication in 1958. It takes places a few hundred years in the future, and we find ourselves situated within a commune of humans that through selective breeding have extended human life expectancy to one and a half to two and half times the natural lifespan. […]