Combine genius IQ with a fifteen year old girl, add Psi powers, and a government agency with an interest, and you get Telzey Amberdon. Interesting group of stories from a lesser known author, in reprint.
Good concept, although I guess you have to give the main character a genius IQ in order to explain why a 15-year-old teenager can handle all these problems successfully.
I thought the "Sleep No More" and "The Lion Game" segments about the mutant human strains were a bit over done. However, considering some of the off-the-wall premises used by numerous sci-fi authors today, many will consider that concept very plausible.
The two segments I liked best were the ones without Telzey in them.