This document discusses free radicals and antioxidants. It explains that free radicals are unstable molecules formed during normal metabolism that can damage cells, while antioxidants help neutralize free radicals. The document provides a brief history of research on free radicals and antioxidants. It also discusses the ORAC scale for measuring antioxidant levels in foods and recommends consuming a daily ORAC value of 30,000 or more for health benefits.