Santa Claus must use advanced technologies to pull off his annual feat. Thankfully, NewScientist has the exclusive about the what and the how. "He relies on some impressive gadgets: miniature flying robots, advanced satellites, highly sensitive surveillance devices, memory-erasing milk, self-assembling toys, and a warp-drive-powered sleigh that's capable of bending and twisting space-time to such an extent that it slips Santa and his reindeer out of the observable universe. In 1949, Kurt Gödel published one of the first mathematical descriptions of how it could work. In his version, the universe has paths called closed time-like curves that might allow you to jump in a ship, fly for a while, and end up right back where you started in space and time."