Dave Davies

The Human Factor gives a behind-the-scenes view of the peace effort between Israel and Palestine. We talk with filmmaker Dror Moreh and Dennis Ross, President Clinton's point man in the effort.

New Yorker writer John Colapinto says the development of vocal structures may have been the key to humans' becoming the dominant species on the planet. His new book is This is the Voice.

Biographer Janice Nimura tells the Blackwell sisters' story in the new book, The Doctors Blackwell. Nimura says Elizabeth was "greeted with everything from rejection to hilarity" during her years at Geneva Medical College in upstate New York.