Scoop: ROCK CENTER WITH BRIAN WILLIAMS on NBC - Friday, February 8, 2013

Kate Snow reports on sisters who are the fastest endurance runners in the country. Yet at only 10 and 12 years old, Snow addresses the issue many may be asking, are their parents pushing them too far? Meet Kaytlynn and Heather Welsch who have participated in more than 200 grueling races in the past 2 years, on rugged trails and over steep hills, tree roots and rocks. Most weekends, they either train or compete. They both want to win, and they both want to beat each other. But is so much running healthy for young girls?

Lester Holt tells the story of a national hero who has been compared to Captain Chesley "Sully" Sullenberger, the hero of the Miracle on the Hudson. Bound for Warsaw, Captain Tad Wrona had one shot at saving the lives of 230 passengers when the landing gear went out on the Boeing 767, and he was forced to make an emergency landing.

In a new book that explores what normal is when it comes to relationships between romantic partners; Natalie Morales sits down with one of the authors of The Normal Bar, Chrisanna Northrup and her husband Mark Northrup. The couple opens up to Morales about how the revealing survey results helped save their 15-year marriage.

BrIan Williams wraps up the broadcast with a look back at what has people talking. From this week's news to some of the quirky stuff online, it will be worth talking about tomorrow. #ROCKBOTTOM

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