The Eyjafjallajökull volcano reminds us, as Larry Brilliant said: We know very little about a lot.
From Sean Stiegemeier:
So I saw all of these mediocre pictures of that volcano in Iceland nobody can pronounce the name of, so I figured I should go and do better. But the flights to get over took forever as expected (somewhat). 4 days after leaving I finally made it, but the weather was terrible for another 4. Just before leaving it got pretty good for about a day and a half and this is what I managed to get.