The Medical journal 'The Lancet' called Oral Rehydration Therapy (ORT) "the most important medical advance of the 20th Century". This simple, low-tech, low-cost treatment is able to prevent death stemming from diarrhoeal diseases. Incredibly, they account for 1 in 9 child deaths worldwide, making diarrhoea the second leading cause of death among children under the age of 5.