IMAGE OF THE WEEK
Microscope image of sand from Corsica.
I saw this on MeFi and found it fascinating. I tend to imagine sand as, basically, billions of little cube-shaped particles, like table-salt or sugar -- but the reality, as is usually the case, turns out to be much more interesting than that. I had no idea there were shellfish that small, for instance. The picture links to a site with a bunch of other equally fascinating microscope images of sand, from beaches around the world.