William Lawrence Bragg was an English physicist born on March 31, 1890. He is best known for his work in the field of X-ray crystallography, which involves using X-rays to determine the atomic structure of crystals. In 1915, he shared the Nobel Prize in Physics with his father, William Henry Bragg, for their contributions to this important scientific technique. Bragg's research laid the foundation for many advancements in materials science and biology. His work helped scientists understand the arrangement of atoms in various substances, leading to significant discoveries in fields such as chemistry and medicine. Bragg's legacy continues to influence modern science today.