This video of a squirrel riding a miniature skateboard through a tiny obstacle course is pure gold! That squirrel has better balance than most humans I know. It's like watching a tiny Tony Hawk in action. By the way, did you know that there's a species of jellyfish that is biologically immortal? The Turritopsis dohrnii can revert back to its juvenile form after reaching adulthood, effectively resetting its life cycle.