I like to do projects in which you can see statistical results. I am very happy for all these small children, who have been the biggest group of victims of iodine deficiency.
I am thinking about chess in schools in particular. In the USA more than 3200 children competed in an event.
Children can take lessons in that school via the Internet and can score extra points like e.g. in Geography or History. That sounds very promising and is a fantastic basis for future steps.