"The Navajo called them the Anasazi: an enigmatic race of southwestern cliff dwellers. For centuries, the sudden disappearance of this proud and noble people has baffled historians. Summoned to a dark desert plateau by a desperate letter form an old friend, renowned investigator Mike Raglan is drawn into a world of mystery, violence, and explosive revelations. Crossing the border beyond the laws of man and nature, he will learn the astonishing legacy...

I’ve had a most amazing time....”So begins the Time Traveller’s astonishing firsthand account of his journey 800,000 years beyond his own era—and the story that launched H.G. Wells’s successful career and earned him his reputation as the father of science fiction. With a speculative leap that still fires the imagination, Wells sends his brave explorer to face a future burdened with our greatest hopes...and our darkest fears. A pull of the...

"Flatland: A Romance of Many Dimensions, though written in 1884, is still considered useful in thinking about multiple dimensions. It is also seen as a satirical depiction of Victorian society and its hierarchies. A square, who is a resident of the two-dimensional Flatland, dreams of the one-dimensional Lineland. He attempts to convince the monarch of Lineland of the possibility of another dimension, but the monarch cannot see outside the line. The...

Although they seem like scene-stealing sci-fi stories, they are based in actual ideas and thought-out theories. How close are we to flying through space or going back in time? Could we really change history or affect the future? Would there be downsides? The ethics of changing things should be explored, and every possible thread would need to be tied up. Could we even time travel responsibly, or would things just unravel? If only we could look into...

Psychologist Sam Towne, certain that the human mind has the psychic ability to create a ghost, assembles a group of eight people to test his theories and ends up fighting for his life against a powerful and deadly apparition.

Time-travel researcher Ned Henry shuttles back and forth between the 21st century and the 1940s in order to correct an incongruity brought forward from the past.

Time travel in the pulps -- Special relativity and time travel in the future -- Time travel to the past -- Hyperspace -- Time as the fourth dimension -- The block universe -- When general relativity made time travel honest -- Paradoxes: changing the past, causal loops, and sex -- Time machines that physicists have already 'invented' -- Faster-than-light (FTL) into the past -- Quantum gravity, splitting universes, and time machines -- Reading the physics...