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Time Is Not Made to Flow in vain: Eternity and Apocalypse in Assynt and Mars

Just in time for World Space Week, I've got a new Guest Blog up at Scientific American Blogs, featuring geological musings on our home planet and our beautiful, desolate neighbour. This post resulted from a recent holiday in the Scottish Highlands, where some of the oldest rocks on Earth can be found, with a surprising story to tell. Go check it out!

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