
Scratching May Have an Evolutionary Purpose, But You Still Need to Resist the Urge
Ever had poison ivy? If so, you probably noticed that scratching made the rash much worse. But scratching an itch, especially one as intense as that caused by poison ivy, is nigh irresistible — and feels so satisfying. If you think about it, says Daniel Kaplan, who is a dermatologist and immunologist at the University…