Letters to the Editor
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Santa's role for even older kids
In our household, Santa brings my kids -- now in their 20s -- presents that would be inappropriate for their parents to give them. When they were in their late teens, for instance, Santa put packages of condoms in their stockings. Now Santa seems to favor giving flavored vodkas. Of course, my wife and I disapprove of such things, but Santa's just a jolly old elf.
As to whether the world is flat, mathematicians would call the earth being flat a good local approximation. If you went around believing the world is flat, you wouldn't run into any difficulties and things might be easier to compute, unless you moved quite a distance away.