Last week I, and more people than at any time in history, were in the path of totality of a solar eclipse. It is an impossible thing. Factors aligned by random chance 4.5 billion years ago to make a total solar eclipse possible, and one day they will end. It is proof that the universe is so unfathomably massive, making an uncountable number of dice rolls at every moment, that any technically possible result is bound to happen somewhere. Not only does Earth have eclipses, but for a time it has a society capable of wondering at them, appreciating them, and commemorating them.