It is theoretically possible for Santa Claus to deliver a gift to every child on the planet in a single night -- but only if he employs an army of helpers and uses exotic relativity clouds capable of warping space time, scientists say. That would allow each helper to spend months delivering gifts, while for those of us outside the cloud, just a few minutes would pass. "I think it’s very possible that a man who ... has flying pet reindeer could have the technology needed to utilize relativity clouds," said doctoral student Danny Maruyama.