Every year scientists around the world are baffled by the seemingly miraculous ability of Santa Claus to visit a billion children in a single night.
It's a topic of fierce debate among researchers.
Previous holiday seasons have seen academic papers published on everything from the optimum aerodynamic design of a sleigh to questioning whether Santa travels through eleven dimensions of space to make his deliveries on time.
Science reporter William Ray canvassed some of the country's top minds to uncover the science of Santa.
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