Being one of the 8 global public health campaigns World Blood Donor Day is celebrated every year on the 14th of June since 2004. 470ml of blood is all it takes for you to be a hero, artificial blood cannot be manufactured; hence blood donation remains as a vital source for helping patients worldwide. This day is celebrated on the birthday of a well known immunologist named Karl Landsteiner, who won the Nobel Prize in medicine for discovering the ABO blood group system.