"From one of our foremost thinkers and public intellectuals, a radical new view of the nature of time and the cosmos What is time? This deceptively simple question is the single most important problem facing science as we probe more deeply into the fundamentals of the universe. All of the mysteries physicists and cosmologists face--from the Big Bang to the future of the universe, from the puzzles of quantum physics to the unification of forces and...

A new America called Valhalla grows restless under the controlling long arm of the Datum government, while all of the Long Earth is infused by the song of the trolls who are starting to react to humanity's thoughtless exploitation, bringing humankind to the brink of war.

A group of children and a "spirit" go back through time to discover the beginnings of Halloween.

It has been two years since Joseph Harker first Walked between dimensions, met the alternate forms of himself, and formed a team to protect the Altiverse in the struggle between the vicious forces of magic and science--and now, injured, he has returned to his own dimension, bringing danger with him.

Contacted by an alien civilization that invites them to join the interstellar community, The Next struggle to get help from the industrious human race to build an artificial intelligence called The Machine.

"All it takes is one hit on the football field, and suddenly Ash's life doesn't look quite the way he remembers it. Impossible though it seems, he's been hit into another dimension--and keeps on bouncing through worlds that are almost-but-not-really his own. The changes start small, but they quickly spiral out of control as Ash slides into universes where he has everything he's ever wanted, universes where society is stuck in the past...universes...

After mastering the ability to walk between dimensions, sixteen-year-old Joey Harker and his fellow InterWorld freedom fighters embark on a mission to maintain peace between the rival powers of magic and science who seek to control all worlds.

A rising star in theoretical physics offers his awesome vision of our universe and beyond, all beginning with a simple question: Why does time move forward?

Lobsang's pursuit of a human life, Joshua's search for his father, and the adaptation efforts of "the Next" post-humans are challenged by a voracious alien race that would conquer and colonize the Long Earth. 2045-2059. Human society continues to evolve on Datum Earth, its battered and weary origin planet, as the spread of humanity progresses throughout the many Earths beyond. Lobsang, now an elderly and complex AI, suffers a breakdown, and disguised...

When her long-lost father, the inventor of the original Stepper device, contacts her, Sally joins him on an ill-fated voyage to Long Mars, while U.S. Navy Commander Maggie Kauffman leads an expedition to the outer limits of the far Long Earth, and Joshua becomes embroiled in the plight of the Next.