The use of sunscreen is essential to prevent premature aging and skin cancer. Sun exposure is the main cause of premature skin aging, as the sun's UV rays damage skin cells and destroy collagen and elastin, resulting in wrinkles, blemishes, and sagging. In addition, unprotected sun exposure increases the risk of developing skin cancer.
26 January 2023 marks three years since WHO launched its first OpenWHO.org course on the then-novel coronavirus and started providing accessible, up-to-date and informative health knowledge for a diverse global audience amid the fast-evolving pandemic. As of this date, OpenWHO offers a total of 190 online courses, 46 of which address COVID-19 topics, and has totaled 7.4 million course enrolments.