While reporting on the phenomenon of T-shirts originating in the U.S. and winding up in Africa, NPR Planet Money recently turned up a Bat Mitzvah T-Shirt in Nairobi and asked for help tracking down the owner. After some Facebook sleuthing - and pinging the wrong Rachel Williams a couple of times - JTA's Adam Soclof finally got in touch with Rachel Aaronson, who led him to Jennifer.