How To Hear Sounds Halfway Around The World

How could scientists in the UK hear an underwater explosion 19,000 kilometers away in Australia? It' not an experiment you could reproduce in a pool, even a very large one, because the speed of sound is more variable than you may think, and so are the conditions in different parts of the ocean. MinuteEarth explains. I won't guarantee you 'll understand it all, but it does remind us that the world is a very weird place, and there's always more to learn about it. (via Digg)