Some of the earliest dinosaurs – from which the later and larger ones evolved – were found in the U.S. by Paul Sereno of the University of Chicago. Here in a 2004 discussion he describes how he and his student assistants went about finding them and extracting them from the ground and, dating them.

We are joined by Tom Fleming, author of “The Great Divide: The Conflict Between Washington and Jefferson.”

Shortly after he got out of prison, Erlichman, a central White House and Watergate figure, came to chat. He told us how his boss – President Richard Nixon – should have handled the Watergate affair once it was disclosed to the public. Here’s a memorable excerpt.

In this 2000 program, Nathanial Philbrick, author of “In the Heart of the Sea,” recounts the true-life story that probably inspired Melville’s Moby Dick. The Essex, a whaleship out of Nantucket, was completely destroyed by the great sperm whale that it was pursuing  in the South Pacific about a thousand miles east of the Marquesas Islands.