Why we often remember the bad better than the good

Negative emotion is the purview of youth. Studies suggest that we tend to notice the bad more than the good, a phenomenon that likely has its roots in evolution. After all, a lot of information can be learned in difficult or dangerous situations, which our brains can then apply in the future. Simply put, it's more important for survival to notice a lion in the brush than a beautiful sunset. Allie Caren dissects psychologist Laura Carstensen's latest research into positive and negative memories and why she believes that we get better at enjoying life as we age.