A. Serotonin: Normally affiliated with temper regulation and thoughts of well-being, serotonin plays an important function in modulating emotions like happiness and contentment. Fast Get: This is often Piaget at its best. As I wrote in our GPHG preview, this felt similar to the very clear standout in the category https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/