It also raises questions about whether we understand time, and how we perceive it. Once we move outside the present day, can we ever return or do we move into an alternate world? What happens if our meddling with Nature leads to time flowing backwards, or slowing down or stopping all together? Or if we get trapped in a constant loop from which we can never escape. Is the past and future immutable or will we ever be able to escape the inevitable?These are just some of the questions that are raised in these challenging, exciting and sometimes amusing stories by Kage Baker, Simon Clark, Fritz Leiber, Christopher Priest, Kristine Kathryn Rusch, Robert Silverberg, Michael Swanwick, John Varley and many others.

    Clarke, Jack Finney, Joe Haldeman, Ursula K. Le Guin H.G. Wells's seminal novella The Time Machine, published in 1895, provided the springboard for modern science fiction's time travel explosion. Responding to their own fascination with the subject, the greatest visionary writers of the twentieth century penned some of their finest stories. Here are eighteen of the most exciting tales ever told.

    Sister Lilith - Honoree Fanonne JeffersThe Comet - W.E.B. Du Bois Chicage 1927 - Jewelle GomezBlack No More (novel excerpt) - George S. Schuyler separation anxiety - Evie Shockley Tasting Songs - Leone RossCan You Wear My Eyes - Kalamu ya SalaamLike Daughter - Tananarive Due Greedy Choke Puppy - Nalo Hopkinson Rhythm Travel - Amiri Baraka Buddy Bolden - Kalamu ya SalaamAye, and Gomorrah... - Samuel R. Delany Ganger (Ball Lightning) - Nalo HopkinsonThe Becoming - Akua Lezli HopeThe Goophered Grapevine - Charles W. ChestnuttThe Evening and the Morning and the Night - Octavia E. Butler Twice, at Once, Separated - Linda Addison Gimmile's Songs - Charles R. Saunders At the Huts of Ajala - Nisi Shawl The Woman in the Wall - Steven Barnes Ark of Bones - Henry Dumas Butta's Backyard Barbecue - Tony Medina Future Christmas (novel excerpt) - Ishmael ReedAt Life's Limits - Kiini Ibura Salaam The African Origins of UFOs (novel excerpt) - Anthony JosephThe Astral Visitor Delta Blues - Robert Fleming The Space Traders - Derrick Bell The Pretended - Darryl A. Smith Hussy Strutt - Ama PattersonEssays. Racism and Science Fiction - Samuel R. DelanyWhy Blacks Should Read (and Write) Science Fiction - Charles R. Saunders Black to the Future - Walter MosleyYet Do I Wonder - Paul D. MillerThe Monophobic Response - Octavia E. Butler

    These were her very own planets, with such fascinating features as the Sea of Morning Opals, the Mountains of White Cloud, wicked Canal cities, and lost lands full of magic and mystery.That girl's name is Leigh Brackett. And today, more than 35 years after selling her first science fiction story, she continues to thrill and excite all lovers of imaginative writing. Her haunting tales of ancient Mars, wind-swept Venus, and remote worlds beyond human technology have become almost instant classics in the genre; and now Edmond Hamilton, Leigh's husband and a great SF writer in his own right, has personally collected ten of her best stories into a beautiful hardcover anthology. Here's a preview of the amazing tales:THE JEWEL OF BAS. There's an ancient legend passed down among the people of the outermost planet. It tells of Bas the Immortal, possessor of the Stone of Destiny—a jewel of such power that owning it gives a man rule over the whole world. Ciaran and Mouse, two unscrupulous gypsies, only half-believed the story until they found themselves at the mercy of Bas's fierce android army ... pawns in a sinister plan to enslave the human race.THE VANISHING VENUSIANS. For years the space colonists had wandered the hellish eternal seas of Venus, seeking the home that was their birthright, death constantly stalking in their wake. And now they were making their final bid—three of their bravest fighting toward a promised land guarded by nightmare creatures. Who would emerge victorious? Close to 4000 desperate people waited anxiously for the answer...THE VEIL OF ASTELLAR. Tough, hardbitten Steve Vance ... once he was human! But three hundred years ago he betrayed his homeland for a race of alien vampires who fulfilled his every desire in return for a small "favor." All he had to do was lure innocent Earth spaceships to their doom on the vampires' world. He knew his soul was forever damned. But there was one way in which he might atone...THE QUEER ONES. Hank Temple was at the editor's desk when the hospital called him in to see the X-rays. They were of a hill girl's illegitimate baby, and they showed insides like no child ever had. That was the beginning ... and the end came on an enshrouded Ozark mountain, with deadly green lightning flickering and a sound in the sky that was not wind or thunder...

    Simak"The Accountant" by Robert Sheckley"Novice" by James M. Schmitz "Child of Void" by Margaret St. Claire "When the Bough Breaks" by Lewis Padgett "A Pail of Air" by Fritz Leiber "Junior Achievement" by William Lee "Cabin Boy" by Damon Knight "The Little Terror" by Will F. Jenkins "Gilead" by Zenna Henderson "The Menace From Earth" by Robert Heinlein "The Wayward Cravat" by Gertrude Friedberg "The Father-Thing" by Philip K. Dick "Star Bright" by Mark Clifton "All in a Summer Day" by Ray Bradbury "It's a Good Life" by Jerome Bixby "The Place of the Gods" by Stephen Vincent Benet "The Ugly Little Boy" by Isaac Asimov

    Scattered Among Strange Worlds tackles issues of emigration, diaspora and loss of cultural values; and the threads of family that bind us strongly, even across the void of space..."Scattered Along the River of Heaven": Zhiying and Anshi were once comrades in arms, the driving forces behind a revolution that led to the foreign colonisers withdrawing from Felicity Station. But what happens after the revolution is won, and the only enemies left are within your own ranks?"Exodus Tides": The child of a mermaid and a human, Emilie has always known herself to be different. Growing up in Paris, in a post-apocalyptic country radically transformed by the mass arrival of mermaids as refugees, she has always yearned to return to the sea--the lost, unattainable country devastated by the Dark King and his cohorts. But sometimes, wishes can be granted in the most perilous manner...

    K. Jemisin, Charles Yu, Jamie Ford, and more. For many Americans, imagining a bright future has always been an act of resistance. A People's Future of the United States presents twenty never-before-published stories by a diverse group of writers, featuring voices both new and well-established. These stories imagine their characters fighting everything from government surveillance, to corporate cities, to climate change disasters, to nuclear wars. But fear not: A People's Future also invites readers into visionary futures in which the country is shaped by justice, equity, and joy.Edited by Victor LaValle and John Joseph Adams, this collection features a glittering landscape of moving, visionary stories written from the perspective of people of color, indigenous writers, women, queer & trans people, Muslims and other people whose lives are often at risk.Contributors include: Violet Allen, Charlie Jane Anders, Ashok K. Banker, Tobias S. Buckell, Tananarive Due, Omar El Akkad, Jamie Ford, Maria Dahvana Headley, Hugh Howey, Lizz Huerta, Justina Ireland, N. K. Jemisin, Alice Sola Kim, Seanan McGuire, Sam J. Miller, Daniel José Older, Malka Older, Gabby Rivera, A. Merc Rustad, Kai Cheng Thom, Catherynne M. Valente, Daniel H. Wilson, G. Willow Wilson, and Charles Yu.