Some 390 million people around the world are affected by dengue fever every year. To help fight the disease, Grey Kuala Lumpur developed a device known as the RainSprout, which contains a patch impregnated with a larvicide. The RainSprout is fixed to the top of an umbrella and when rain hits the patch, the larvicide is released and mixes with the rainwater. As the rainwater falls off the umbrella to the ground, the larvicide destroys the mosquito larvae. The project was commissioned by the Malaysian digital mobile service provider, Webe, which funds projects that will lead to positive change.