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Sheryl Sandberg, David McCullough

|Why aren't more women in leadership positions? Facebook's Sheryl Sandberg tells Norah O'Donnell women need to learn to "lean in."; then, Popular author and historian David McCullough guides Morley Safer on an American historical journey, discovering many issues of today are the same as those of long ago; and, He accompanies him to Paris, the most important city in the world at the founding of the U.S. and a place that had a profound influence on the new nation.

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