This podcast episode explores the science behind sunscreen and the common mistakes people make when applying it. The hosts emphasize the importance of using sunscreen for maximum protection against skin cancer and highlight the significance of avoiding common mistakes such as using old sunscreen and not applying enough. The episode discusses the different types of sunscreen, the ongoing safety review of sunscreen chemicals, and the importance of reapplying sunscreen every few hours. It also provides tips for maximizing sun protection and checking for skin cancer in areas with less melanin. Overall, the episode aims to educate listeners on the proper use and storage of sunscreen to ensure effective skin protection.