Carl Landsteiner

Carl Landsteiner was a prominent scientist who discovered important aspects of blood. In 1901, he identified different blood types (A, B, AB, and O), which explained why some blood transfusions work and others don't. This discovery helped make blood transfusions safer and more effective, saving many lives. Landsteiner's work earned him the Nobel Prize in Physiology or Medicine in 1930. His findings are fundamental to medicine today, especially in surgery and emergency care. Overall, his contributions greatly advanced our understanding of blood and how it interacts within the human body.