The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better. Track the facts with Jack and Annie!! When Jack and Annie got back from their adventure in Magic Tree House Merlin Mission #17: A Crazy Day with Cobras, they had lots of questions. Can snakes really be charmed? What reptile has the deadliest venom? What do Komodo dragons eat? How do you tell alligators and crocodiles apart? Find out the answers to these questions and more as Jack and Annie track the facts.