Answer
Manfred Eigen passed away in 2019, the same year he won the Nobel Prize in Chemistry alongside George Pimentel for their work on chemical kinetics and self-organizing systems. Eigen's research significantly contributed to our understanding of how complex systems, including biological ones, arise from simple interactions. His innovative approaches, such as relaxation kinetics and cross-relaxation techniques, continue to impact various scientific fields, making his legacy enduring in the scientific community.