I was standing in the kitchen this morning, washing plates in the sink, when it started to hail. It came as a complete surprise to me as, from where I stood, by the kitchen window, the sun was shining and the sky looked blue. The small, white beads bounced all over the slabs outside, each finally coming to rest. Less than a minute later, the shower came to an end, as suddenly as it had started. By then, the first hailstones to land had already melted.
It struck me, why travel the world when the world will come to me? Molecules of water in these hailstones will have traveled the world themselves, flowing down the Amazon, spending centuries locked in glaciers and ice floes, plumbing the deepest parts of the ocean, towering in the sky as cumulus clouds. They may have been lapped up by dinosaurs. They may even have orbited the sun as part of a comet. And when you look at it like that, astronomy becomes the only science.