Reversible Computing (2016) [video] (youtube.com) https://news.ycombinator.com/item?id=16007128 https://news.ycombinator.com/item?id=16007128 https://www.yout

Reversible Computing (2016) [video] (youtube.com) https://news.ycombinator.com/item?id=16007128 https://news.ycombinator.com/item?id=16007128 https://www.youtube.com/watch?v=rVmZTGeIwnc https://www.youtube.com/watch?v=rVmZTGeIwnc DonHopkins on Dec 26, 2017 | next [–] Billiard Ball cellular automata, proposed and studied by Edward Fredkin and Tommaso Toffoli, are one interesting type of reversible computer. The Ising spin model of ferromagnetism is another reversible cellular automata technique. https://en.wikipedia.org/wiki/Billiard-ball_computer https://en.wikipedia.org/wiki/Billiard-ball_computer https://en.wikipedia.org/wiki/Reversible_cellular_automaton https://en.wikipedia.org/wiki/Reversible_cellular_automaton https://en.wikipedia.org/wiki/Ising_model https://en.wikipedia.org/wiki/Ising_model If billiard balls aren't creepy enough for you, live soldier crabs of the species Mictyris guinotae can be used in place of the billiard balls. https://www.newscientist.com/blogs/onepercent/2012/04/researchers-build-crab-powered.html https://www.newscientist.com/blogs/onepercent/2012/04/resear... https://www.wired.com/2012/04/soldier-crabs/ https://www.wired.com/2012/04/soldier-crabs/ http://www.complex-systems.com/abstracts/v20_i02_a02.html http://www.complex-systems.com/abstracts/v20_i02_a02.html Robust Soldier Crab Ball Gate Yukio-Pegio Gunji, Yuta Nishiyama. Department of Earth and Planetary Sciences, Kobe University, Kobe 657-8501, Japan. Andrew Adamatzky. Unconventional Computing Centre. University of the West of England, Bristol, United Kingdom. Abstract Soldier crabs Mictyris guinotae exhibit pronounced swarming behavior. Swarms of the crabs are tolerant of perturbations. In computer models and laboratory experiments we demonstrate that swarms of soldier crabs can implement logical gates when placed in a geometrically constrained environment.