Why do we remember the past and not the future? What does it mean for time to "flow"? Do we exist in time or does time exist in us? In lyric, accessible prose, Carlo Rovelli invites us to consider questions about the nature of time that continue to puzzle physicists and philosophers alike.--

"The essential universe, from our most celebrated and beloved astrophysicist. What is the nature of space and time? How do we fit within the universe? How does the universe fit within us? There's no better guide through these mind-expanding questions than acclaimed astrophysicist and best-selling author Neil deGrasse Tyson. But today, few of us have time to contemplate the cosmos. So Tyson brings the universe down to Earth succinctly and clearly,...

In the 28th century, Valerian and Laureline are a team of special operatives charged with maintaining order throughout the human territories. Under assignment from the Minister of Defense, the two embark on a mission to the astonishing city of Alpha. A mystery is at the center of Alpha, a dark force which threatens the peaceful existence of the city. "An expansive, expensive adventure whose creativity outweights its more uneven elements."--Variety. "Valerian...

Once again, Artemis will have to pair up with his old comrade, captain Holly Short, to track down the missing demon and rescue him before the time spell dissolves and the lost demon colony returns violently to Earth.

America's most celebrated astrophysicist invites young readers to explore the mysteries of the universe.

Faster than light travel is impossible--until the discovery of The Flow, an extradimensional field available at certain points in space-time, which can take us to other planets around other stars. Riding The Flow, humanity spreads to innumerable other worlds. Earth is forgotten. A new empire arises, the Interdependency, based on the doctrine that no one human outpost can survive without the others. It's a hedge against interstellar war--and, for the...

The Next--the hyper-intelligent post-humans--realize that the missive they received from the center of the galaxy contains instructions for kick-starting the development of an immense artificial intelligence knows as The Machine. But to build this computer the size of an Earth continent, they must obtain help from the more populous and still industrious worlds of mankind.

The magic tree house whisks Jack and Annie away to Australia where they must save some animals from a wildfire.

While Pendragon is trapped on Ibara, Alder returns to Denduron and reluctantly goes into battle again, and other Travelers face obstacles of various sorts, Saint Dane gains the power he seeks on Second Earth and makes his push to destroy and rebuild Halla.

Londons fall and kingdoms rise while darkness sweeps the Maresh Empire, and the fraught balance of magic blossoms into dangerous territory while heroes struggle.