Death of Adolf Windaus (German chemist), June 9. Adolf Windaus was a prominent German chemist known for his work in organic chemistry and biochemistry. Born in 1876, he dedicated much of his career to researching steroids and vitamins. Windaus is recognized for his discoveries regarding the chemical structure of sterols and their role in the human body. In 1928, Adolf Windaus was awarded the Nobel Prize in Chemistry for his research on sterol compounds and their connection to vitamin D. His studies played a significant role in advancing the understanding of vitamin metabolism and the treatment of diseases such as rickets. Windaus also served as a professor at the University of Göttingen, mentoring many students who later became notable scientists themselves. Adolf Windaus passed away on June 9, 1959. His scientific contributions remain influential in the fields of chemistry and medicine, and his research laid the groundwork for later advances in vitamins and steroids. He is remembered in the history of science as a pioneer in biochemical research. This observance was added to the Gregorian calendar in 1959 to recognize Windaus's significant scientific impact, and the decision to include this date was made to commemorate his role in the advancement of chemistry and biology. It is typically marked by the publication of scientific notes and academic commemorations.