"One man's magic is another man's engineering...'"
Obviously Santa is on to something we don't know about- the reindeer are just for show; he's messing with spacetime on a very basic level... some kind of spacetime- bubble generator, allowing relativistic speeds without the nasty side-effects.
No proof, of course, but it'd be very hard to disprove.
I still believe, because even after I figured out where my folks stashed the presents before Xmas Eve, causing them to have to admit that yes, they bought the presents, there was always at least one gift marked "From Santa". Sure his handwriting looked a lot like my mother's, but heck, I was able to duplicate her signature later (very handy for dealing with the principal's office at school!), so why couldn't Santa Claus do it?
