Heroes of Progress, Pt. 4: Karl Landsteiner and Richard Lewisohn

Introducing Austrian scientist Karl Landsteiner and German surgeon Richard Lewisohn. Landsteiner discovered the existence of different blood groups and Lewisohn developed procedures that allowed blood to be stored outside of the body without clotting. The two breakthroughs made blood transfusions far more practical and are credited with saving over 1 billion lives.

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