E54: Lourdes Water - A Holy Cure?

This natural spring in the Grotto of Massabielle is a small cave-like enclosure in the southern countryside of France. In 1862, the Catholic Church authenticated claims that the Virgin Mary made an apparition at the grotto to a young girl. Blind people can suddenly see, the lame can walk and the depressed experience euphoria. Is it a placebo effect or does the water have magical powers only some can experience?