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YET another volcano blew its top in Iceland on Saturday and started spewing ash into the stratosphere. At least this time round most of us can pronounce its name – Grímsvötn. While the eruption is bigger than Eyjafjallajökull’s last year, the ash is coarser and so should not ground as many flights.

Grímsvötn has already released 10 to 100 times as much ash as Eyjafjallajökull, but Dave Rothery, an earth scientist in the volcano dynamics group at the Open University in Milton Keynes, UK, says the Eyjafjallajökull eruption was particularly disruptive because it produced such fine ash. That’s…