In 2018, novelist Jami Attenberg, faced with a looming deadline, needed motivation. Using a boot camp model, she and a friend set out to write one thousand words every day for two weeks. They opened this practice to Attenberg's online community, and soon hundreds--then thousands--of people started using #1000WordsofSummer to track their work and support one another. What began as a simple challenge between two friends has become a literary movement--write...