Twitter co-founder Jack Dorsey has recently launched Sun Day, a cutting-edge iOS app that uses real-time UV data to estimate Vitamin D synthesis based on your location, skin type, and sun exposure. This innovative app offers personalized insights to enhance sunlight exposure and prevent deficiencies. As part of a rising trend in AI-driven health tools, Sun Day aims to improve overall well-being through tailored guidance. Explore how this open-source project is reshaping preventive health and digital wellness solutions.