Linus Pauling is one of only two people in history to receive two unshared Nobel Prizes. He won the Nobel Prize in Chemistry in 1954 for his pioneering work on the nature of the chemical bond, research that transformed modern chemistry and provided the foundation for molecular biology. His studies on protein structure helped other scientists identify DNA’s double helix, and he later advanced research on vitamins and human health. Pauling also received the Nobel Peace Prize in 1962 for his tireless campaign against nuclear weapons testing, becoming a leading scientific voice for peace during the Cold War. His career joined rigorous scientific discovery with outspoken advocacy, leaving a legacy that reshaped both science and civic life.