Do all of your cells swap themselves out every few years? Or do some parts of you stick around for your whole life? Skunk Bear's beautifully animated video explores the body in search of something constant.

Science reporter Adam Cole got in a car and followed the precise migration path of a mysterious snowy owl named Baltimore. Thanks to cutting edge tracking technology, he was able to visit the exact perches Baltimore chose: a piece of driftwood on the Jersey coast ... the top of a Manhattan skyscraper ... the roof of the smallest radio station in Canada. Along the way, he met the people touched by Baltimore's migration, and learned about the life of an owl in unprecedented detail.