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Nearly one hundred of you came up with the correct answer to the final Santalytics 2019 challenge: 1916.
Yes, unfortunately Santa landed smack in the middle of World War I. But, fortunately, he also arrived just after Karl Schwarzschild solved Einstein’s field equations. With these exact solutions in hand, Santa now has all the information he needs to escape the black hole - namely, the radius of the event horizon given the mass of the black hole, as well as the escape velocity (the speed of light). Thanks to your efforts, Santa escaped the black hole and returned to 2019 in time to carry out his delivery duties!