A young girl from an Asian village is skipping along a dirt road on her way to draw water from a nearby stream-bank, her bare feet kicking up the dust. She waves to some of the women washing clothing by the bank, and cheerfully calls out to the children playing in the shallows. After prodding a cow out of the way with a stick, she quickly fills her jug with water. It all seems perfectly safe, but in reality, the villagers’ lives are in danger because of something they cannot even see.