60 Minutes 1/19 - a podcast by CBS News Radio

More sharks are being spotted near beaches in the North Atlantic Ocean, some just feet from the shoreline. Why the sharks are swimming so close and how scientists are tracking them? The reintroduction of the predator has led to more visitors and a shift in the ecological makeup of Yellowstone Park. And, "National Geographic" photographer Joel Sartore shows us how his shots come together and why he started his Photo Ark project. Bill Whitaker will have these stories on this week's "60 Minutes."

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