What lies beyond the reach of the naked eye, and how do these hidden forces shape our lives? This hour, TED speakers reveal forgotten cities, underwater canyons, tiny parasites, and a boiling river.

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Tags:  Ted Radio Hour,  underwater,  forgotten cities,  underwater canyons,  parasites,  boiling river,  ocean,  ocean exploration,  abe davis,  ed yong,  sarah parcak,  robert ballard,  andres ruso,  Culture, History, Heritage,  History,  People and Places,  Education