Visitors to a small log cabin in Kentucky are right to ask: Is it true that Abraham Lincoln slept here? On the eve of Lincoln's 209th birthday tomorrow, Brook Silva-Braga has the answer: 

Professor Henri Grissino-Mayer has come to Hodgenville, Kentucky to solve a mystery almost as old as Abraham Lincoln himself.

Silva-Braga asked, "So, someone pulls off the highway, sees you guys drilling into this cabin and says, 'What are you doing here?' what do you say to them?"

"What we're trying to do is authenticate when this cabin was made by using the tree rings in the logs," he replied.