From mobile check-in systems to AI-driven service models, hospitality leaders often chase the next big innovation. But new research suggests one of the most powerful guest experience tools is also the oldest: a genuine smile. According to a joint study by Hampton by Hilton and Goldsmiths, University of London, guests who were greeted with a smile were 3.5 times happier during their stay and 75% more likely to return. The researchers used eye-tracking glasses and facial analysis software to monit...