SIGNS:

Stones Self-Organize into Circles (Sarah Graham, January 20, 2003, Scientific American)

It sounds like the stuff of science fiction: stones arranging themselves into perfect circles or elaborate labyrinths. But the forces behind these mysterious patterns, which are commonly found in many polar and high alpine environments, are much more pedestrian--simple cyclic freezing and thawing of the surrounding ground. A numerical model that can account for the unusual patterns is described in the current issue of the journal Science.

Okay, but how did natural forces place the lintel pieces at Stonehenge? Posted by Orrin Judd at February 3, 2003 2:29 PM