A STUDENT MADE A $100 MILLION IDEA A Korean student built an app that finds walking routes based on shade - something normal maps never considered. Geuneullo predicts where shadows will be using the sun’s position, building heights, and city data, helping people survive extreme heat. - It creates routes that avoid direct sunlight instead of just saving time - It can even suggest the best seats on buses to stay in the shade - It became Korea’s top-ranked app during a 35°C heatwave - Hundreds of thousands of people have already used its shade-based routes Big tech built maps for faster travel. One student built maps for a more comfortable world.