history-society

Simple vs Complex Contagions For twenty years, everyone knew how ideas spread. Malcolm Gladwell had explained it in The Tipping Point. Mark Granovetter had proved it with "The Strength of Weak Ties." The conventional wisdom was clear: information spreads fastest through weak connections—acquaintances, not close friends. If

Nicholas Christakis: Connected Nicholas Christakis was a hospice doctor before he became a network scientist. He spent years watching people die—and watching how death affected the people around them. One pattern kept recurring. When someone died, their spouse often followed within months. Doctors called it "dying of a

Your Opinions Aren't Yours: They're Infections In 2012, Facebook ran an experiment on 689,003 users without telling them. For one week, the company manipulated what appeared in people's News Feeds. Some users saw fewer positive posts from their friends. Others saw fewer negative

Network Contagion Your opinions feel like yours. They're not. They're infections—caught from the people around you, spreading through networks you can't see, following rules that have nothing to do with truth or logic. This isn't metaphor. It's network science.

Synthesis: Are We Next? Peter Turchin made a prediction in 2010 that got him labeled a crank. The Russian-American complexity scientist had been feeding historical data—centuries of it, from dozens of societies—into mathematical models. The models kept spitting out the same answer: the United States was entering a

Case Studies: Rome, Byzantium, Maya In 476 CE, Odoacer deposed the last Western Roman Emperor, a teenager named Romulus Augustulus. The date appears in every textbook as THE END OF ROME. The fall of civilization. The beginning of the Dark Ages. Here's what actually happened: almost nothing. No