With the help of spider scientist Sebastian Echeverri, Maddie presents the case for why spiders are the best and coolest animal. Spoiler alert: some travel thousands of kilometers by "ballooning," while others live part time underwater. Are you a scientist who thinks Sebastian is wrong and that the animal you study is superior? Let us know! You can email us at shortwave@npr.org. We'd love to hear the case for your critter.