What does it take to be happy? Abigail Pogrebin talks to the women authors behind the latest wave of books on how to find happiness in modern life and discovers their surprisingly modest answer.

Abigail Pogrebin on what she learned about herself—and her twin—writing her new book on the same subject, One and the Same.

In an excerpt from her new book, One and the Same, Abigail Pogrebin talks to twin sisters who survived the Nazi doctor's monstrous experiments at Auschwitz.