Jo Nagai has been raising butterflies since he was in second grade. His curiosity led to an unlikely friendship with a Georgetown professor half a world away.
Jo Nagai of Kobe, Japan began hand-raising swallowtail butterflies when he was just a second grader.
But when it came time to release them to the wild, Nagai realized a peculiar pattern of behavior — the butterflies often lingered after release, even... [4050 chars]