In 'Human Chain,' Nobel-Winning Poet Seamus Heaney Digs Into the Past

In his native Ireland, he\'s known as "Famous Seamus," and indeed, Seamus Heaney -- winner of the Nobel Prize in 1995 -- is a world-famous poet. Now 72, his new collection, "Human Chain," contains poems that are, as always for him, grounded in the physical world but also take a look back.