The average cruise ship has doubled in size in just the last ten years. Some engineers fear that these towering behemoths are dangerously unstable,and the recent tragedy of the Costa Concordia has raised new questions about their safety. Now, NOVA brings together marine engineering and safety experts to explain famous cruise disasters...are we on the brink of a 21st century Titanic? NOVA...8PM
And Yul Kwon journeys across the continent by air, road and rail, venturing behind the scenes with the workers who get us where we need to go...he listens in on a call with NASA, the secret service, the military and every major airline to learn how our national flight plan works today. The second installment of AMERICA REVEALED...9pm
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