Book about a man studying aliens. Modifies his body to get closer to them and ultimately doesn't see himself as human anymore
52399
Man undergoes radical surgery to research aliens
50313
Novel where a man is paid to travel to a planet inside a metallic sphere
26358
Book about ancient Martian astronauts being the root of modern humanity and time travel
126418
Story about encounter with hostile aliens
81131
Post-apocalyptic book where people can enhance or alter their appearance with animal qualities
18991
Book about attack by aliens that decimate entire human fleet and take a single prisoner
26391
SF Story about human adapting to alien environment
50938
SF novel where body swapping/modification is widespread
45680
A science fiction story about a headdress that allows one human to control and experience another human's body
60657
Title of a book telling about people teleported to a hostile planet while in deep meditation
97483
Looking for book: contact with aliens, five different races, mismatched claws, biological imperative to breed
85565
Sci-fi book about a male entering a competition that he wins and gets recruited by millitary
85251
Tracking down an old sci-fi book
87947
Employment office encounters an alien masquerading as a human
126070
Looking for an old story where humans conceal their newly-discovered psychic abilities from alien visitors
105978
Short story about the drawbacks of human telepathy on an alien planet
155483
Science-fiction book where the protagonist has a hidden blade inside his body