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David Levin

Marine biologist Colleen Reichmuth works with walruses. She says that, like dolphins, they can communicate using an amazing variety of sounds.

Anthropologist and explorer Kenny Broad studies some of the world's most dangerous places—underwater caves called "Blue Holes."

Anthropologist Barbara McLeod explains how she learned to speak ancient Maya.

Sam Bowring studies mass extinctions in the Earth's past. He says humans might not be around much longer... geologically speaking.

Leech expert Mark Siddall explains why leeches can survive on nothing but blood.

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