Science of Christmas

Every year about this time, children all over the world start asking some prickly questions. How does Santa get all the way around the world in one night? How can he possibily fit all those presents in one sleigh, and how do reindeer fly? But for the answers to these difficult questions we can turn to science. Dr. Roger Highfield was the science editor of The Daily Telegraph for two decades. Now he's the editor of New Scientist, a highly prestigious scientific journal. He's also the author of a book that answers all those difficult Christmas questions, Can Reindeer Fly: The Science of Christmas.