This week on Unexplainable or Not, Sally Helm, the newest member of our team, tries to figure out what's killing mussels, why rivers suddenly change course, and what the longest river in the world is. Guests: Douglas Edmonds, professor at Indiana University; Neel Dhanesha, science reporter For show transcripts, go to vox.com/unxtranscripts For more, go to vox.com/unexplainable And please email us!
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