Why It Feels Good to Scratch

Skin might seem like a simple messenger, telling the brain if it's hot, if it's cold, or whether that rock underfoot is sharp. But scientists are now finding that the nerve-based conversation between the skin and the brain is far more complex than most people realize. Take, for example, the seemingly simple act of scratching an itch. A child will scratch and scratch a rash to the point of drawing blood and feel relieved. But he'll cry if he scrapes his knee on the ground. What's the... Full Story