Invest it in a micro-finance venture, particularly one in a 3rd World Country (I believe the best known one is this, in Bangladesh - http://www.grameen-info.org

Invest it in a micro-finance venture, particularly one in a 3rd World Country (I believe the best known one is this, in Bangladesh - http://www.grameen-info.org/ http://www.grameen-info.org/) The famed 97%+ repayment rates have been questioned, so it's not necessarily the best financial investment you'll make, but for a class project it kicks ass - your $10 goes to a poor woman, who uses it to help her community and her family, pays it back so you can do it again and again. Man, teachers eat that stuff up.