Not just another science audiobook and not just another Discworld novella, The Science of Discworld is a creative, mind-bending mash-up of fiction and fact, that offers a wizard’s-eye view of our world that will forever change how you look at the universe.

Hackett, in his trusty ship the Perseus, is not just a space traveller—beginning his travels with an expedition to Neptune and back—but, thanks to the time-dilation effect, a time traveller as well. His new mission will take him to Andromeda, to get a close-up look at the constellation which will eventually crash into the Milky Way, and give humanity a heads-up about the challenges which are coming. A mission which will take him five million years to complete. Not only is Hackett exploring unknown space, but he will return to a vastly different time.

A nightmarish danger threatens from the other side of reality. . . . Armed with only a frying pan and her common sense, young witch-to-be Tiffany Aching must defend her home against the monsters of Fairyland. Luckily she has some very unusual help: the local Nac Mac Feegle—aka the Wee Free Men—a clan of fierce, sheep-stealing, sword-wielding, six-inch-high blue men.

The very far future: The galaxy is a drifting wreck of black holes, neutron stars, and chill white dwarfs. The age of star formation is long past. Yet there is life here, feeding off the energies of the stellar remnants, and there is mind, a tremendous galaxy-spanning intelligence each of whose thoughts lasts a hundred thousand years. And this mind cradles memories of a long-gone age when a more compact universe was full of light... The 27th century: Proxima Centauri, an undistinguished red dwarf star, is the nearest star to our sun. How would it be to live on such a world?

A delightfully funny, fantastically inventive collection of twenty unearthed short stories by Sir Terry Pratchett, the award-winning and bestselling author and creator of the phenomenally successful Discworld fantasy series. These rediscovered tales were written by Terry Pratchett under a pseudonym for British newspapers during the 1970s and 1980s. The stories have never been attributed to him until now, and might never have been found—were it not for the efforts of a few dedicated fans.

The Light of Other Days tells the tale of what happens when a brilliant, driven industrialist harnesses the cutting edge of quantum physics to enable people everywhere, at trivial cost, to see one another at all times: around every corner, through every wall, into everyone's most private, hidden, and even intimate moments. It amounts to the sudden and complete abolition of human privacy - forever.

For eons, Earth has been under observation by the Firstborn, beings almost as old as the universe itself. The Firstborn are unknown to humankind - until they act. In an instant, Earth is carved up and reassembled like a huge jigsaw puzzle. Suddenly the planet and every living thing on it no longer exist in a single timeline.

The Witch's Vacuum Cleaner and Other Stories is the second fabulously funny short story collection from the late acclaimed storyteller Terry Pratchett. A follow-up to Dragons at Crumbling Castle, this second batch of storytelling gems features stories written when Sir Terry was just 17 years old and working as a junior reporter. In this audiobook new Pratchett fans will find wonder, mayhem, sorcery, and delight - and loyal listeners will recognize the seeds of ideas that went on to influence his most beloved tales later in life.

Somewhere on the frontier between thought and reality exists the Discworld, a parallel time and place that might sound and smell very much like our own, but which looks completely different. Particularly as it’s carried though space on the back of a giant turtle (sex unknown). It plays by different rules. But then, some things are the same everywhere. The Disc’s very existence is about to be threatened by a strange new blight: the world’s first tourist, upon whose survival rests the peace and prosperity of the land.

Thirteen-year-old Mau is the only one left after a giant wave sweeps his island village away. But when much is taken, something is returned, and somewhere in the jungle, Daphne - a girl from the other side of the globe - is the sole survivor of a ship destroyed by the same wave.

When The Sandman, also known as Lord Morpheus - the immortal king of dreams, stories and the imagination - is pulled from his realm and imprisoned on Earth by a nefarious cult, he languishes for decades before finally escaping. Once free, he must retrieve the three “tools” that will restore his power and help him to rebuild his dominion, which has deteriorated in his absence.

As the mighty alien fleet from the very latest computer game thunders across the computer screen, Johnny prepares to blow them into the usual million pieces. And they send him a message: We surrender. They're not supposed to do that! They're supposed to die. And computer joysticks don't have 'Don't Fire' buttons. But it's only a game... isn't it?

In the middle of climate-change crises, there is no mood for space-exploration stunts - but Reid Malenfant, elderly, once a shuttle pilot and frustrated would-be asteroid miner, decides to go take a look anyway. Nothing more is heard of him. But his ex-wife, Emma Stoney, sets up a trust fund to search for him the next time the Kernel returns...By 2570 Earth is transformed. A mere billion people are supported by advanced technology on a world that is almost indistinguishable from the natural, with recovered forests, oceans, ice caps.

From early work like "Rescue Party" and "The Lion of Comarre", through classic stories including "The Star", "Earthlight", "The Nine Billion Names of God", and "The Sentinel" (kernel of the later novel and movie 2001: A Space Odyssey), all the way to later work like "A Meeting with Medusa" and "The Hammer of God", this comprehensive short story collection encapsulates one of the great science fiction careers of all time.

Jack Kernigan is having a bad day...a bad year...a bad life. After being booted out of MIT, he’s back in his Ohio hometown, working for the family business, facing a life of mediocrity. Then one day, out on a delivery, his truck hits...something. Something big...something furry...something invisible. And, it turns out, something not of this Earth. Fate can play funny tricks. Which is why Jack suddenly finds himself the planet’s best hope to unravel a conspiracy of galactic proportions that could spell the end of the human race.

The very far future: The galaxy is a drifting wreck of black holes, neutron stars, and chill white dwarfs. The age of star formation is long past. Yet there is life here, feeding off the energies of the stellar remnants, and there is mind, a tremendous galaxy-spanning intelligence each of whose thoughts lasts a hundred thousand years. And this mind cradles memories of a long-gone age when a more compact universe was full of light... The 27th century: Proxima Centauri, an undistinguished red dwarf star, is the nearest star to our sun. How would it be to live on such a world?

It isn’t easy to get a group of bestselling SF authors to write new stories for an anthology, but that’s what Elizabeth Anne Hull has done in this powerhouse book. With original, captivating tales by Greg Bear, Gregory Benford, Ben Bova, David Brin, Cory Doctorow, Neil Gaiman, Joe Haldeman, Harry Harrison, Larry Niven, Vernor Vinge, Gene Wolfe, and others, Gateways is a SF event that will be a must-buy for SF readers of all tastes, from the traditional to the cutting edge; from the darkly serious to the laugh-out-loud funny.

It is 2019. NASA astronaut Nigel Walmsley is sent on a mission to intercept a rogue asteroid on a collision course with Earth. Ordered to destroy it, he instead discovers that it is actually the shell of a derelict space probe - a wreck with just enough power to emit a single electronic signal….

When 17-year-old Toby McGonigal finds himself lost in space, separated from his family, he expects his next drift into cold sleep to be his last. After all, the planet he' s orbiting is frozen and sunless, and the cities are dead. But when Toby wakes again, he' s surprised to discover a thriving planet, a strange and prosperous galaxy, and something stranger still - that he' s been asleep for 14,000 years. Welcome to the Lockstep Empire, where civilization is kept alive by careful hibernation. Here cold sleeps can last decades and waking moments mere weeks.

Maddy should have died in a plane crash. Liam should have died at sea when the Titanic sank. Sal should have died in a tragic fire. But a mysterious man whisked them away to safety. Maddy, Liam, and Sal quickly learn that time travel is no longer just a hope for the future; it is a dangerous reality. And they weren't just rescued from their terrible fates…they were recruited for the agency of TimeRiders created to protect the world from those seeking to alter the course of history for personal gain.

Howard Falcon almost lost his life in an accident as the first human astronaut to explore the atmosphere of Jupiter - and a combination of human ingenuity and technical expertise brought him back. But he is no longer himself. Instead he has been changed into an augmented human: part man, part machine, and exceptionally capable.

On September 28th, a geologist working in Death Valley finds a mysterious new cinder cone in very well-mapped area. On October 1, the government of Australia announces the discovery of an enormous granite mountain. Like the cinder cone, it wasn't there six months ago.

Something is happening to planet Earth, and the truth is too terrifying to contemplate

After more than two hundred years as a corpsicle, Jaybee Corbell awoke in someone else’s body and under threat of instant annihilation if he made a wrong move while they were training him for a one-way mission to the stars. But Corbell bided his time and made his own move. Once he was outbound, where the society that ruled Earth could not reach him, he headed his starship toward the galactic core.

Cities all around the world reported strange alien vessels descending. Some saw them as the heralds of a new age; others fired everything they had at them. All were taken as the beams lashed down and drew them into the sky. Dean was left behind, seemingly the last man on Earth. A trail of clues left by his dead wife guides Dean on a perilous journey across America and beyond to learn the truth behind the mysterious ships and save humanity from its doom.

Under the benevolent leadership of the League of Peoples, there is no war, little crime, and life is sacred...unless you're an Explorer. The ugly, the flawed, the misfit, the deformed, they are the unwanted, flung to the farthest corners of the galaxy to investigate hostile planets and strange, vicious creatures. Out there, there are a thousand different - and terrible - ways to die.

It's 1944. As war rages in Europe and the Pacific, army intel makes a shocking discovery: a 300-foot Japanese sub, marooned and empty, deep in the Brazilian interior. A team of army rangers sent to investigate has already gone missing. Now the military sends Captain R. J. MacCready, a quick-witted, brilliant, scientific jack-of-all-trades, to learn why the Japanese are there - and what they're planning.

Paleontologist Brandon Thackery and his rival, Miles "Klicks" Jordan, fulfill a dinosaur lover's dream with history's first time-travel jaunt to the late Mesozoic. Hoping to solve the extinction mystery, they find Earth's gravity is only half its 21st-century value and dinosaurs that behave very strangely. Could the slimy blue creatures from Mars have something to do with both?

Amahle is a Light Chaser—one of a number of explorers, who travel the universe alone (except for their onboard AI), trading trinkets for life stories. But when she listens to the stories sent down through the ages, she hears the same voice talking directly to her from different times and on different worlds. She comes to understand that something terrible is happening, and only she is in a position to do anything about it. And it will cost everything to put it right.

Humans call them Monument-Makers. An unknown race, they left stunning alien statues scattered on distant planets throughout the galaxy, encoded with strange inscriptions that defy translation. Searching for clues about the Monument-Makers, teams of 23rd century linguists, historians, engineers and archaeologists have been excavating the enigmatic alien ruins on a number of planets, uncovering strange, massive false cities made of solid rock. But their time is running out.

Geoff and his friends live in Phocaea, a distant asteroid colony on the Solar System's frontier. They're your basic high-spirited young adults, enjoying such pastimes as hacking matter compilers to produce dancing skeletons that prance through the low-gee communal areas, using their rocket-bikes to salvage methane ice shrapnel that flies away when the colony brings in a big (and vital) rock of the stuff, and figuring out how to avoid the ubiquitous surveillance motes.