I would invest, then invest some more. Say there is $5 million left...
I'd give it to the homeless, and buy some neat things for school. Say, school sanctioned ipads. ( we were donated those at my school 2 years ago)
Then i'd do some cancer research funding, and help make science classes more enjoyable. Not any namby-pamby 'we can't do labs for buck' labs, like in most schools, I mean labs where you actually have fun. Chem reactions, van de graffs( actual, powerful ones) and the likes.