Well, from what I can tell from reading over at Newswise Science News it’s a combination of:
electromagnetic waves, the space/time continuum, nanotechnology, genetic engineering and computer science
Covering 200 million square miles delivering to 80 million homes can’t be easy but Santa manages it every time.
“Based on his advanced knowledge of the theory of relativity, Santa recognizes that time can be stretched like a rubber band, space can be squeezed like an orange and light can be bent,” Silverberg says. “Relativity clouds are controllable domains – rips in time – that allow him months to deliver presents while only a few minutes pass on Earth. The presents are truly delivered in a wink of an eye.”
You learn something new every day.