'Alfred Bernard Noble, a Swedish inventor and philanthropist bequeathed most of his vast fortune in trust as a fund from which annual prizes could be awarded to individuals and organizations who had achieved the greatest benefit to humanity in a particular year. Originally, there were six classifications for outstanding contributions designated in Nobel's will including physics, chemistry, physiology or medicine, literature, and international peace, In 1969 a prize for economics endowed by the Central Bank of Sweden was added, The prizes are usually presented in Stockholm on December 10, with the king of Sweden officiating, an appropriate tribute to Alfred Nobel on the anniversary of his death.' What does this passage mainly discuss?