A detailed analysis of three species-rich ecosystem food webs has shown that they display scale-free distributions of connections. Such graphs of interaction are in fact shared by a number of biological and technological networks, which have been shown to display a very high homeostasis against...

The relation between stable (zero-gradient) points and cellular automata dynamics is explored. Both the number and the nature of stable points influence to some extent the complexity class and stability of rules, and the existence of spatio-temporal structures such as gliders.