Germany has recently wrapped up a bold experiment with the four-day workweek, and the results are nothing short of intriguing. In fact, 73% of companies that participated in the trial have decided they won’t return to the traditional five-day schedule. This shift could be a glimpse into the future of work. The “100-80-100” model, as it’s called, suggests that fewer hours at work don’t necessarily mean lower productivity—and might even lead to happier, healthier employees.