The World's Most Unavoidable Carcinogen (IMAGE) American Chemical Society Caption When we go outside, we expose ourselves to the most common carcinogen of all: ultraviolet (UV) rays in sunlight. Most of us know we should apply sunscreen to protect our skin, but some of us forget and suffer a flaky, irritated sunburn in return. In this week's Reactions, we highlight the chemistry behind UV radiation, melanin and sunburns. See the video here: <a href="https://youtu.be/7ZXvngquyT4" target="_blank">https://youtu.be/7ZXvngquyT4</a>. Credit The American Chemical Society Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.