Reply All

Best story in today's NYTimes pic.twitter.com/vgbQpHpMaB

— David Wessel (@davidmwessel) September 2, 2016

Hitting “reply all” on a multi-person email can start a chain reaction that never ends. In fact, it can be like rolling a snowball down a mountain, where it gathers more and more snow until it’s bigger than a house. Sometimes it ends in a picnic and a viral story, like the Berkeley Spampocalypse last year. But usually, it just annoys everyone. The New York Times has some advice on such an event. -Thanks, John Farrier!