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well you also need to factor in the total time of 24 hours as well as the unknown weight and size of the cargo. we cannot forget there is also the mass and size of the sleigh, the effects of inertia when taking off and stopping and friction. now factor out non christians who do not celebrate the birth of Christ. as well as children over 10 years old. then when you factor in the naughty list those numbers are reduced significantly more. even then to deliver gifts to those children that are left is not possible with current technology