One hundred years ago, Japan gifted some 3,000 cherry trees to the United States in a gesture of friendship. They now flower each spring around the tidal basin in Washington, D.C. On Monday, Secretary of State Hillary Clinton announced that the U.S. will return the favor. Audie Cornish talks with Richard Olsen of the U.S. National Arboretum about the plan to send 3,000 American dogwoods to Japan.