The surprising backstory of Martin Luther King's most famous speech.

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Every year at this time, folks in Tully, New York, harvest ice out of a frozen lake with horsepower and antique tools.

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From the moment they hatch, penguin chicks must protect themselves from a hostile world.

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Giant bells, elaborate costumes, and beautiful yodels: it's New Year's Eve in Urnäsch, Switzerland. 

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In order to thrive in the icy waters off Antarctica, penguins have had to make a few sacrifices, including the ability to fly.

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