"Two events made September 1st a memorable day for Jesse Cullum. First, he lost a pair of Oakley sunglasses. Second, he saved the life of President Ulysses S. Grant. It's the near future, and the technology exists to open doorways into the past--but not our past, not exactly. Each "past" is effectively an alternate world, identical to ours but only up to the date on which we access it. And a given "past" can only be reached once. After a passageway...

The search for the map{u2014}and the secret behind its cryptic code{u2014}intensifies in a quest across time, space, and multiple realities.

The author guides us through space and time, leading us from the familiar sights of the night sky to the dazzlingly strange aftermath of the Big Bang.

Four cousins, Roger, Ann, Eliza, and Jack, have an extraordinary summer when, after an old toy soldier comes to life, they find themselves transported back to the days of Robin Hood and Ivanhoe.

Presents the continuing adventures of Henry York, who has been living in Kansas with his cousins, where he discovers doorways leading to other worlds and becomes involved in a multi-world struggle between good and evil.

Budding scientist Lucy builds a rocket ship and accidentally sends her beloved dog, Laika, into space.

With Saint Dane seemingly on the verge of toppling all of the territories, Pendragon and Courtney set out to rescue Mark and find themselves traveling--and battling--their way through different worlds as they try to save all of Halla.

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.

Are smart phones really humanity's most significant innovation since the moon landings? Or can something else explain why the bold visions of the 20th century--fusion power, genetic enhancements, artificial intelligence, cures for common disease, extended human life, and a host of other world-changing advances--have remained beyond our grasp? Why has the high-tech future that seemed imminent in the 1960's failed to arrive? Perhaps it did arrive......