An excellent anthology containing some seminal science-fiction tales. These stories are thought-provoking, which is generally the whole idea of science fiction: to provoke (and promote) thought. The overall theme is. What does it mean to be a human being? And, What happens when we come up against things (and "people") we can't handle?
I'm not going to review all the stories in the book; I'll mention just a few.
C.M. Kornbluth's famous story "The Marching Morons" has been reprinted many times. Kornbluth died young, and it's tempting to wonder what he might have achieved had he lived longer. Here he posits a future in which the general IQ has diminished to the point where the average person is little more than a cheery doofus. The few remaining "above average" people have to monitor and care for these "morons." What Kornbluth did NOT foresee was that the "morons" would turn out to be bigoted, hateful bastards, not unlike MAGA types today. Even so, the burden of caring for them leads the future guardians to a drastic solution.
John Brunner contributes "Such Stuff," in which dream deprivation studies push one man into a waking nightmare.
"The Seller of the Dream" by John Jakes, who wrote a fair bit of science fiction before turning his attention to blockbusters, details the attempts of Finn Smith to rescue the girl he loves from a mega corporation that is using her body and personality as a template to market to other women.
"The Large Ant" by Howard Fast concerns the discovery of a race of tool-using "ants" as big as small dogs, that seem to be encroaching on humanity. It's scarier than it sounds.
"Compassion Circuit" by John "Day of the Triffids" Wyndham, is a creepy story about a man whose sick wife is cared for by a robot nurse, who takes her brief to save the woman far beyond the pale.
In "A Planet Called Shayol," by the brilliant Cordwainer Smith, people regarded as criminals are exiled to a world on which microscopic "dromozoa" infect the inmates, causing extra body parts to grow. These parts are harvested by the bull-like warden, and sent offworld to assist people in need of them. Because the process is painful, the inmates are drugged periodically. Beautifully written, as with all his work, but dark -- yet with a hint of redemption.
Damon Knight was another writer whose work has been neglected. His story, "Stranger Station," puts a lone human in a distant space station, along with a monstrous alien whose secretions prolong human life. Why have the aliens agreed to provide this "service"?
Anyway, this short review can't do justice to the stories. Among the other writers are Ron Goulart, Hal Clement, Fritz Leiber and Christopher Anvil. It would be worth your while to dig it up, maybe on eBay. This is science fiction the way it used to be written, with the idea of "story" preeminent.