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Why mild preferences can build a segregated town: Schelling's chequerboard Nobody in this town wants it split into blue and orange districts. Each household only asks that a few of its neighbours look like it. Yet run the rule and the… Economics4 min read How thousands of fireflies flash in time with no leader: pulse-coupled oscillators On riverbank trees in Southeast Asia, thousands of male fireflies flash together, with no leader and no shared clock. Each insect is just a small timer that… Biology4 min read Ten thousand fireflies, no conductor Once a year in the Great Smoky Mountains, thousands of fireflies flash on and off together, down to a fraction of a second, for hours. No leader calls the… Biology6 min read