Every 20 seconds a child dies from diarrhoea and pneumonia, the top two causes of child deaths. Yet these deaths are largely preventable. Studies show that washing hands with soap is one of the most effective - and inexpensive - ways to reduce child mortality. Orange Clean, a Chinese brand of soap, wanted to show the impact hand-washing has in child's health. We developed a special device to dispense the soap, making su children wash their hands correctly.