Chronic pain is pain that has lasted for a long time.Migraine is a chronic neurological disorder characterized by recurrent moderate to severe headaches often in association with a number of autonomic nervous system symptoms.Allodynia means “other pain.” It is a pain that results from a stimulus that is not normally painful. Neurotransmitters are the brain chemicals that communicate information throughout our brain and body. They relay signals between nerve cells called “neurons.” The brain uses neurotransmitters to tell your heart to beat, your lungs to breathe, and your stomach to digest. Neuroscientist Daniel Wolpert starts from a surprising premise: the brain evolved, not to think or feel, but to control movement. In his TED Talk he gives us a glimpse into how the brain creates the grace and agility of human motion.Elliot Krane works on the problem of treating children with pain at Lucile Packard Children’s Hospital at Stanford.