Terry Gross

Lt. Col. John Nagl commands the 1st Battalion, 34th Armor at Fort Riley, Kan. He served in Operation Desert Storm and was the operations officer of a tank battalion task force in Operation Iraqi Freedom. He helped author the Army's Counterinsurgency Field Manual.

Hamburg-born Astrid Kirchherr met the Beatles in 1960, before they were famous. She took some of the earliest photographs of the group and was engaged to Stuart Sutcliffe, the Beatles' original bassist, before he died of a brain hemorrhage in 1962.

David Kirkpatrick is a correspondent in the Washington bureau for The New York Times. He covered the politics of the conservative Christian movement in the 2004 election, and has been following the presidential campaign of former Arkansas Governor Mike Huckabee.