O'Keefe, Emily

"Any unexplained object that people see in the sky is known as an Unidentified Flying Object, or UFO. Today, one in seven Americans claims to have seen a UFO. Learn more in Investigating UFOs, a World's Greatest Mysteries book"--From the publisher's web site.

"The earliest known record of crop circles is more than 300 years old. Today, more than 10,000 have been recorded around the world. Learn more in Investigating Crop Circles, a World's Greatest Mysteries book"--From the publisher's web site.

"Details the actions of nurses, doctors, medics, ambulance drivers, and other medical personnel during World War I. Additional features include a bullet-point summary of the events, compelling narrative descriptions, primary source quotes and accompanying source notes, questions to spark critical thinking, sources to guide further research, historical photographs, informative captions, a table of contents, an index, and a phonetic glossary."--Amazon.com.

"Details the Austrian Archduke's assassination from the perspectives of those involved"--Provided by publisher.

Examines the September 11 terror attacks of 2001 from perspective of President George W. Bush.

"Humpback whales use unique songs to communicate throughout the world's oceans. But whaling and other threats almost silenced humpback whales completely ... [This book] describes the characteristics of these animals and how bans on whale hunting and other efforts have helped save this distinctive species"--Provided by publisher.

Explores the myths, facts and mysteries surrounding Inidentified flying objects.

Explores crop circles and the mysteries around them, looking at how they may be created, strange things that happen in the fields where they are, and more.

Readers hear stories from survivors of the mile-wide tornado that struck Joplin, Missouri, in May 2011.