Sharks have been swimming in our planet's waters for hundreds of millions of years. They even predate dinosaurs. Despite that, little is known about them - where they swim and how they mate, for instance. Hard data might be lacking but that hasn't stopped humans from developing a deeply negative attitude towards sharks. That relationship is the topic of a new book, called "Demon Fish," by Washington Post journalist Juliet Eilperin who joins Madeleine.
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