My dad just sent me this, so i thought id share this with you guys. enjoy

There are approximatly two billion children (persons under 18 ) in the world. However, since Santa does not visit children of Muslim, Hindu, jewish or Buddhist (except in Japan) religions, this reduces the workload for christmas night to 15% of the total, or 378 million (according to the population reference bureau)
At an average (census) rate of 3.5 children per household, that comes to 108 million homes, presuming there is at least one good child in each.
Santa has about 31 hours of christmas to work with, thanks to the different time zones and the rotation of the earth, assuming east to west (which seems logical). This works out to 967.7 visits per second. This is to say that for each christian household with a good child, Santa has around 1/1000th of a second to park the sleigh,  hop out, jump down the chimney, fill the stocking, distribute the remaining presents under the tree, eat whatever snacks have been left for him, get back up the chimney, jump into the sleigh and get onto the next house. Assuming that each of the 108 million stops are evenly distributed.
Around the earth (which, of course, we know to be false, but will accept for the purposes of our calculations), we are now talking about 0.78 miles per household, a total trip of 75.5 million miles, not counting bathroom breaks and stops. This means Santas sleigh is moving at 650 miles per second - 3000 times the speed of sound. for purposes of comparison, The fastest manmade vehicle, the Ulysses space proble, moves at a pokey 27.4 miles a second, and a conventonal reindeer can run (at best) 15 miles per hour.

the payload of the sleigh adds another interesting element. Assuming that each child gets nothing more than a medium sized lego set (two pounds), the sleigh is carrying aver 500 thousand tons, not counting Santa himself. On land, a conventional reindeer can pull no more than 300 pounds. Even granting that the "flying" reindeer can pull 10 times the normal amount, the job cant be done with eight, or even nine of them.... Santa would need 360,000 of them. This increases the payload, not counting the weight of the sleigh, another 54,000 tons, or roughly seven times the weight of the Queen Elizabeth (the ship, not the monarch).

600,000 tons traveling at 650 miles per second creates enormous air resistance - this would heat up the reindeer in the same fashion as a spacecraft reentering the earths atmosphere. The lead pair of reindeer would absorb 14.3 quintillion joules of energy per second each. In short, they would burst into flames almost instantaniously, exposing the reindeer behind them and causing the same to happen. the effect would create deafening sonic booms in their wake. The entire reindeer team would be vaporised within 4.26 thousandths of a second, or right about the time Santa reaches the 5th house on his trip.

Not that this matters however, since Santa, as a result of accelerating from a dead stop to 650 m.p.s. in .001 seconds, would be subjected to acceleration forces of 17,000g's. a 250 pound Santa (which seem ludicrously slim) would be pinned to the back of the sleigh by 4,315,015 pounds of force, instantly crushing every bone and organ in his body, and reducing him to a quivering blob of pink goo. Therefore, if Santa did exist, he's dead now

Merry christmas