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Why (and for how long) do butterflies stay in a cocoon? In this episode of Blue Sky Science, Jeremy Hemberger, a graduate student in the entomology department, answers that question posed by Sophie Harrison.

Blue Sky Science was a collaboration of the Wisconsin State Journal and the Morgridge Institute for Research. Scientific questions were posed by visitors to Science Saturdays. The Blue Sky Science team then set out to find an expert to answer the questions.