Time Travel: Is Visiting the Past and Future Possible? Readers will examine the history of time travel, Project Pegasus, famous time travel literature, time slippage, the theory of relativity and more before deciding for themselves! Table of contents, fun facts, a glossary, and an index are included. Aligned to Common Core Standards and correlated to state standards. Checkerboard Library is an imprint of Abdo Publishing, a division of ABDO.