The document describes a study that tested an app called the Yetty Monster App to improve students' growth mindset. The app allows 4th grade students to take photos of tricky words they encounter while reading and feed them to the Yetty Monster. As students collect more words, the Yetty Monster's head grows, visually representing their growth. Students who used the app showed a 7% improvement in growth mindset scores compared to a control group, suggesting visualizing growth through the growing Yetty helped shift students to a more growth-oriented mindset.