From: rwg@sdf.lonestar.org

PS, Veit Elser's difference map algorithm, http://en.wikipedia.org/wiki/Difference_map_algorithm , has become only the second entity to solve the 82% Arnold Dozenegger disk packing puzzle completely unaided. (Not counting Emma Cohen, who got massive clues from Emma Cohen.) Also, it's clear that Rod Stephenson's clustering algorithm will do it, probably in ~1 hr --way longer than Veit's, who clearly has something dangerous.

"Searching with Iterated Maps", free at: http://www.pnas.org/content/104/2/418.full.pdf Yes, scary. --Steve