Explore six of the longest-running scientific experiments in history, including one designed to continue for 500 years. Learn about the dedication and patience required for multi-generational research projects that span decades or centuries, discovering how scientists design studies to outlast their own lifetimes and what these extended experiments reveal about the natural world. Examine the methodologies, challenges, and remarkable findings from experiments that require institutional commitment across generations, and understand how long-term scientific observation contributes to our understanding of slow-moving natural processes and phenomena that can only be studied over extended time periods.