Science Fact or Science Fiction? Ancient Aliens: Did Historic Contact Happen? Rachael L. ThomasAncient Did Historic Contact Happen? Readers will examine the history of alien sightings, architecture, Nazca Lines, UFOs, 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.