Gender bending Sci Fi

In a parallel world in which Neanderthals, rather than homo sapiens, became the dominant intelligent species, a dangerous scientific experiment traps a Neanderthal physicist on Earth. ...

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Private William Mandella is a hero in spite of himself. He never wanted to go to war, but the leaders on Earth have drawn a line in the interstellar sand. ...

50TH ANNIVERSARY EDITION—WITH A NEW INTRODUCTION BY DAVID MITCHELL AND A NEW AFTERWORD BY CHARLIE JANE ANDERS Ursula K. Le Guin’s groundbreaking work of science fiction—winner of the Hugo and Nebula Awards. A lone human ambassador is sent to the icebound planet of Winter, a world without sexual prejudice, where the inhabitants’ gender is fluid. His goal is to facilitate Winter’s inclusion in a growing intergalactic civilization. But to do so he must bridge the gulf between his own views and those of the strange, intriguing culture he encounters... Embracing the aspects of psychology, society, and human emotion on an alien world, The Left Hand of Darkness stands as a landmark achievement in the annals of intellectual science fiction. ...

This classic work of science fiction is widely considered to be the ultimate time-travel novel. When Daniel Eakins inherits a time machine, he soon realizes that he has enormous power to shape the course of history. He can foil terrorists, prevent assassinations, or just make some fast money at the racetrack. And if he doesn't like the results of the change, he can simply go back in time and talk himself out of making it! But Dan soon finds that there are limits to his powers and forces beyond his control. ...