简介： How did Leonardo da Vinci become interested in flight? Whatare some of his most famous paintings? Do his scientific ideasmeasure up to what we know today? Find out the answers to thesequestions and more in Magic Tree House Research Guide: Leonardo daVinci, Jack and Annie’s guide to the mad genius himself.
简介：WHY IS THE arctic so cold? How do polar bears cross thin ice? How did people learn to survive in that harsh climate? Find out the answers to these questions and more in Magic Tree House Research Guide: Polar Bears and the Arctic, Jack and Annie's guide to the arctic. This is the nonfiction companion to Polar Bears past Bedtime.
