A young child looks out a bedroom window seeing the backyard as it would have looked if she had seen it during various historical and geological periods.

Failing to eliminate life on Earth after their first attack, the Firstborn send a Q-bomb weapon to finish the job. Two cryogenically frozen females and a group of scientists studying the Eye, an artifact of the Firstborn, may be the only hope of finding a way to counter the onslaught.

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

The story of physicists quest to answer a mind-boggling question: How can we travel through time? Since H.G. Wellss 1895 classic The Time Machine, readers of science fiction have puzzled over the paradoxes of time travel. What would happen if a time traveler tried to change history? Would some force or law of nature prevent him? Or would his action produce a new history, branching away from the original? In the last decade of the twentieth century,...

Detroit 2030. Don't forgive and never forget has always been Peri's creed. But her day job makes it difficult: she is a drafter, possessed of a rare, invaluable skill for altering time, yet destined to forget both the history she changed and the history she rewrote. When Peri discovers her name is on a list of corrupt operatives, she realizes that her own life has been manipulated by the agency. Her memory of the previous three years erased, she joins...

Faced with a dull summer in the city, Jane, Mark, Katharine, and Martha suddenly find themselves involved in a series of extraordinary adventures after Jane discovers an ordinary-looking coin that seems to grant wishes.