The assignment discusses the efficacy and validity of a recent research study on the effects of using sunscreen, published by the United States Environmental Protection Agency (EPA). The study reveals that while sunscreen is effective in protecting the skin from carcinogenic transformations, it's essential to determine the degree of Sun Protection Factor (SPF) and not assume that a higher SPF provides double protection. The research finding is considered both effective and valid due to its evidential nature and publication by a credible governmental agency.