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As the eruption of Iceland’s volcano Eyjafjallajokull (a nightmare for both airlines and non-Icelandic newscasters) has shut down all of northern Europe’s air travel, the New Scientist presents a nice primer on why and how volcanic ash threatens aircraft:

Volcanic ash from Iceland's Eyjafjallajokull spreads over northern Europe.

Volcanic ash is composed of particles . . . → Read More: Volcanic Ash + Jet Engines