Stress & Anxiety
Dr Robert Sapolsky (see below) is considered by many to be the current leading expert on the topic of stress. He does an excellent job of illustrating how we (humans) uniquely agitate and stress ourselves in ways that go beyond our bodies design for the stress system. While stress is in no way unique to Americans, we certainly have developed an expertise in creating our own stress and anxiety (see WebMD article titled The United States of Anxiety.)
Many consider Mindfulness to be an "antidote" to stress and anxiety. Click here for the free Introduction to Mindfulness Meditation downloadable course.