Things to do when you can’t sleep : xl

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xl : Oceanography

A MOOC via FutureLearn for the small hours.  I have difficulty retaining details by the time I reach the quizzes (how many grams of salt … positive or negative planetary vorticity … eh? what?) but am quite pleased to have encountered the Chilean Blob and the CoFeMUG project (‘pronounced coffee mug’) and I FINALLY have a vague idea why the sea is salty and where the magnesium goes.  Some of the pictures are very pretty too.

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