Iacopo Iacopini Associate Professor in the Network Science Institute at Northeastern University London iacopo.iacopini@nulondon.ac.uk Expertise animal communication, behavioural contagion, bird communication, group dynamics, network science, networks of ingredient combination in global cuisines, teamwork Iacopo Iacopini for Northeastern Global NewsWhy do the latest fads spread like wildfire? Research explainsNetwork scientists found that the social overlap between groups plays a major part in how fast a phenomena or contagious illness transmits.