100 things you should know about Explorers will take you on a journey of discovery as you join the great explorers and chart their voyages into the unknown.  Exactly 100 facts, accompanied by beautiful illustrations and detailed photographs, reveal fascinating facts about early exploration by the ancient Egyptians and Greeks, daring attempts to reach the tops fo the highest peaks, and the first steps into the vastness of space.  Throughout there are puzzles, quizzes, and projects—go exploring with your own homemade compass, create some prehistoric cave art, and find out about the ghost that haunts Mount Everest!