Which American explorer tried - but failed - to walk around the world? What American heiress eschewed a life of ease to explore the Arctic? Who was the first African American astronaut in space? You'll learn the answers to these questions and more when you solve the 50 original puzzles in American Acrostics Volume 7: Puzzling Explorers and Adventurers . Sound like fun? Then sharpen your pencil and get ready to discover fascinating facts about the men and women who have traveled to the "four corners of the earth" - and beyond.