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We keep telling John Larkin that the solar system is non-linear and chaotic , and that any prediction over a longer span than 10 million years isn't go ing to be too reliable. He doesn't get the message,
says something slightly different. Old experts have a particular set of ide as, which more or less work. The rising generation comes up with a bunch of different ideas, some of which more or less work, and sometimes some of th em work better than the old ideas. String theory doesn't seem to work that well, but loop quantum gravity doesn't yet seem to be well enough worked ou t to be demonstrable nonsense.