Every year, millions of dollars worth of value on MTA MetroCards are lost or discarded. However, a student project at NYU called MetroChange takes this value and puts it to good use. The concept is simple: swipe your MetroCard at a MetroChange kiosk and the value on the card is transferred to a central fund. This fund is then donated to a charity once per month while the physical card is taken for recycling. As a daily subway rider and proponent of social good, I am totally in favor of this. Well done, guys!