SF and fantasy that made me think

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Mesklin is a vast, inhospitable, disc-shaped planet, so cold that its oceans are liquid methane and its snows are frozen ammonia. It is a world spinning dizzyingly, a world where gravity can be a crushing 700 times greater than Earth's, a world too hostile for human explorers. But the planet holds secrets of inestimable value, and an unmanned probe that has crashed close to one of its poles must be recovered. Only the Mesklinites, the small creatures so bizarrely adapted to their harsh environment, can help. And so Barlennan, the resourceful and courageous captain of the Mesklinite ship Bree, sets out on an heroic and appalling journey into the terrible unknown. For him and his people, the prize to be gained is as great as that for mankind... Hal Clement's Mission of Gravity is universally regarded as one of the most important and best loved novels in the genre. The remarkable and sympathetic depiction of an alien species and the plausible and scientifically based realization of the strange world they inhabit make it a major landmark in the history of hard sf.

"It is absolutely unique--without question the most fascinating Civil War novel I have ever read." Professor James M. McPherson Pultizer Prize-winning BATTLE CRY OF FREEDOM January 1864--General Robert E. Lee faces defeat. The Army of Northern Virginia is ragged and ill-equpped. Gettysburg has broken the back of the Confederacy and decimated its manpower. Then, Andries Rhoodie, a strange man with an unplaceable accent, approaches Lee with an extraordinary offer. Rhoodie demonstrates an amazing rifle: Its rate of fire is incredible, its lethal efficiency breathtaking--and Rhoodie guarantees unlimited quantitites to the Confederates. The name of the weapon is the AK-47.... Selected by the Science Fiction Book Club A Main Selection of the Military Book Club

Suppose Roosevelt, Stalin, Churchill, Hitler, and Hirohito had united to conquer an even greater foe? No one could top their power—not the Germans, not the Japanese, not the Russians, not the United States. From Pearl Harbor to panzers rolling through Paris to the Siege of Leningrad and the Battle of Midway, war seethed across the planet as flames of destruction rose higher and hotter. And then, suddenly, the real enemy came. The invaders seemed unstoppable, their technology far beyond human reach. And never before had men been more divided. For Jew to unite with Nazi, American with Japanese, and Russian with German was unthinkable. But the alternative was even worse. As the fate of the world hung in the balance, slowly, painfully, humankind took up the shocking challenge. . . .

From New York Times bestselling author Orson Scott Card, Ender's Game—adapted to film in 2013 starring Asa Butterfield and Harrison Ford—is the classic Hugo and Nebula award-winning science fiction novel of a young boy's recruitment into the midst of an interstellar war. In order to develop a secure defense against a hostile alien race's next attack, government agencies breed child geniuses and train them as soldiers. A brilliant young boy, Andrew "Ender" Wiggin lives with his kind but distant parents, his sadistic brother Peter, and the person he loves more than anyone else, his sister Valentine. Peter and Valentine were candidates for the soldier-training program but didn't make the cut—young Ender is the Wiggin drafted to the orbiting Battle School for rigorous military training. Ender's skills make him a leader in school and respected in the Battle Room, where children play at mock battles in zero gravity. Yet growing up in an artificial community of young soldiers Ender suffers greatly from isolation, rivalry from his peers, pressure from the adult teachers, and an unsettling fear of the alien invaders. His psychological battles include loneliness, fear that he is becoming like the cruel brother he remembers, and fanning the flames of devotion to his beloved sister. Is Ender the general Earth needs? But Ender is not the only result of the genetic experiments. The war with the Buggers has been raging for a hundred years, and the quest for the perfect general has been underway for almost as long. Ender's two older siblings are every bit as unusual as he is, but in very different ways. Between the three of them lie the abilities to remake a world. If, that is, the world survives. Orson Scott Card's Ender's Game is the winner of the 1985 Nebula Award for Best Novel and the 1986 Hugo Award for Best Novel. THE ENDER UNIVERSE Ender series Ender’s Game / Ender in Exile / Speaker for the Dead / Xenocide / Children of the Mind Ender’s Shadow series Ender’s Shadow / Shadow of the Hegemon / Shadow Puppets / Shadow of the Giant / Shadows in Flight Children of the Fleet The First Formic War (with Aaron Johnston) Earth Unaware / Earth Afire / Earth Awakens The Second Formic War (with Aaron Johnston) The Swarm /The Hive Ender novellas A War of Gifts /First Meetings