The research won Ig Nobel Prize this year. I think it is interesting that we can find similar patterns in Tokyo rail way system and the movement of slime mold (and more other kinds of network system XD). Enjoy it!
"Rules for Biologically Inspired Adaptive Network Design," Atsushi Tero, Seiji Takagi, Tetsu Saigusa, Kentaro Ito, Dan P. Bebber, Mark D. Fricker, Kenji Yumiki, Ryo Kobayashi, Toshiyuki Nakagaki, Science, Vol. 327. no. 5964, January 22, 2010, pp. 439-42.
Abstract online
http://www.sciencemag.org/cgi/content/abstract/327/5964/439
By the way, Toshiyuki Nakagaki's work on slime mold won Ig Nobel Prize in 2008.
"Intelligence: Maze-Solving by an Amoeboid Organism," Toshiyuki Nakagaki, Hiroyasu Yamada, and Ágota Tóth, Nature, vol. 407, September 2000, p. 470.
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