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	Building Pharaoh's Ship Can the legendary ship of an Egyptian queen sail again?

	Extreme Cave Diving A team of intrepid scientists journey into one of Earth's most dangerous and beautiful underwater frontiers.

	Ghosts of Machu Picchu Why did the Incas abandon their city in the clouds?

	Killer Subs in Pearl Harbor Beneath the waves, discover an untold story of a day that lives in infamy.

	The Pluto Files Take a cross-country journey with Neil deGrasse Tyson to explore the rise and fall of America's favorite planet.

	Riddles of the Sphinx A marvel of ancient engineering is vanishing. Can it be saved?

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