Most spiders are content to sit and wait for unsuspecting victims to blunder into their silken traps, but webs are only ever as good as the structures that secure them to the surfaces that support them. ‘This [attachment] is done with a special type of silk, called piriform’, says Jonas Wolff, from Macquarie University, Australia, adding that most spiders only produce this silk when they need t...

In this paper, an extension of a formalized model of affective decision making is presented, based on the informally described I-PEFiC model. This extension manages that the actions agents undertake have an effect on other agents. The agents change their perceptions and beliefs about other agents if actions are taken. Further, the anger level of the agents is simulated. Simulation experiments s...