Explore the intricacies of sampling rare trajectories in complex systems through this 22-minute lecture presented by the Instituto de Física Interdisciplinar y Sistemas Complejos (IFISC). Delve into advanced concepts and methodologies used to analyze and understand uncommon pathways within intricate systems. Gain insights into the challenges and techniques involved in capturing and studying these elusive trajectories, which play a crucial role in various scientific disciplines. Learn how researchers at IFISC approach this complex topic and discover potential applications in fields such as physics, biology, and computer science.