The article talks about a special chair called "Census" that can sense how people sit at work. Sitting in the wrong way for too long can hurt your back and shoulders, making you feel stressed and work less effectively. The chair can tell if you're sitting correctly or not, and it can even remind you to adjust your posture or take a break. The researchers made sure the chair doesn't bother you while you work. They found that the chair can figure out how you're sitting with about 80% accuracy.