In 1901, Karl Landsteiner mixed blood samples and discovered why transfusions could be deadly
TIMESOFINDIA.COM / Jun 02, 2026, 17:20 (IST)
In 1901 Vienna, Karl Landsteiner's meticulous lab work revealed human blood groups, transforming medicine. Previously perilous transfusions became predictable science after he observed blood cell clumping, identifying incompatible types. This groundbreaking discovery, born from simple observation, paved the way for safe transfusions, saving countless lives and forming a cornerstone of modern medical practice.