An uber-geek must-see: A Turing Machine in Conway's Game Life, extendable to a Universal Turing Machine. Something I'd enjoy having as a poster on my wall.
This is BrainLog, a blog by Dan Sanderson. Older entries, from October 1999 through September 2010, are preserved for posterity, but are no longer maintained. See the front page and newer entries.
September 14, 2001