What's a good way to get people to participate in blood drives? Jon Cherry/Getty ImagesTelling people who have donated blood when and where the blood was used makes them more likely to do it again, according to our new study. Donors who got details like the date and the hospital were 10% more likely to donate again than people who were just thanked. Together with University of Hamburg marketing scholars Besarta Veseli and Michel Clement, we conducted real-world studies, backed by an online exper