The origami crane a stranger folded for her hid a secret message for ten years

When Rika Matsuda crashed her bike at age 7 in Japan, a stranger washed her hurt foot and taught her to fold an origami crane. A decade later she unfolded it and found a handwritten message meaning roughly 'cherish the moment' — her unsung hero had written it while she was on the phone with her grandfather. From NPR's My Unsung Hero series.