UFOs: Are Alien Aircraft Overhead? Readers will examine the history of UFOs, Roswell, alien abduction, Area 51 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. Glossary of key words Index Informative sidebars Reviewed Table of contents Timeline of key events Science Fact or Science Fiction? explores common science fiction themes and theories from both a cultural and scientific perspective. Readers will explore each topic's history, examine evidence, and decide whether the topic is fact or fiction. Famous cases, creatures, and people related to the topic are featured. Full-color and black-and-white photos provide new perspectives, bringing each theory to life. 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

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