Luckily for children everywhere, a group of physicists believe Santa is real, and have worked out how he is capable of giving toys to children around the world. They deal with the issue of his bag, seeing millions of children, if not a billion, children on a single night, and of course making all his toys.
Wormholes, relativity, and an ever moving North Pole are the answers to these questions, and a great opener to these subjects in an introductory physics class. While many of the answers are theories, it is important to remember that ideas such as gravity were also once simple theories.