Nightly News | December 09, 2011
BRIAN WILLIAMS, anchor: A new report out tonight says 517 moon rock samples are either missing or stolen. Only 12 people have ever been to the moon and while those six moon missions brought back 842 pounds of rocks and dust, a lot of them were simply loaned out or have been given away or borrowed over the years. So check your sock drawer. NASA said it will improve its controls. They don't think what it called national treasures are at risk of being lost for good, however.