Mankind has considered gold as a synonym of luxury and prosperity since Ancient Times. This attraction arises from the extraordinary properties of gold, such as extreme stability to ambient conditions, good handling to manufacture diverse objects and a characteristic shining colour. Alchemists devoted their lives to seek for the so-called Elixir of Life almighty potion, a liquid composed of gold which will give the eternal youth to those who drink it, since this metal apparently never changes or interacts with other substances. However, research during the last 25 years has unequivocally demonstrated that, in fact, it is completely the opposite:...