William Harvey discovered blood circulation
Karl Landsteiner, an Austrian biologist, discovered the three blood groups - A, B and C, later named O
Landsteiner and Weiner discovered the Rh system
James Blundell, an English Obstetrician, attempted the first human to human blood transfusion
Decastello and Sturli, Dr Landsteiner's colleagues, discovered the blood type AB
An initiative such as Bleed Hope can only be possible when compassionate souls from different spheres come together because they feel strongly about something.
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Read on for some inspiring stories of people who have given blood and keep coming back, to give more.