America's newest side hustle isn't your usual gig, and it tells a prickly story about the US economy. People selling blood just to get by. >> It was out of necessity.>> Like Ian Pleasant, who started donating at this center outside Philadelphia after being hit by a car and breaking his leg. >> It was a lifesaver. >> It It even paid my rent.>> A lifesaver for him and the patients on the other end with researchers saying the US provides around 70% of the world's plasma. that gooey substance that transports th ...