Hold That Thought Washington University in St. Louis

Climate scientist Bronwen Konecky travels to tropical regions around the world gathering evidence of the geologic past. Using data from rain samples and sediments deep at the bottom of lakes, she is piecing together a story about Earth's climatic history – and what it can tell us about our planet's future.

Religious studies scholars Elaine Pagels and Laurie Maffly-Kipp discuss the Book of Revelation and how it has been interpreted across time, as well as the personal side of their writing and research.

Rebecca Copeland and Laura Miller, coeditors of "Diva Nation: Female Icons from Japanese Cultural History," discuss queens, goddesses, and the nature of “diva-hood.”

Ahead of the midterm elections, Steve Fazzari explores the current state of the economy and explains why widely cited unemployment and growth numbers don't give a full picture.

Over thousands of years, by trial and error, humankind has learned how to produce superior materials for different types of processing. Physicist Ken Kelton talks about materials through the ages.

This Fourth of July, visitors to Washington University's Olin Library will have the chance to see a rare piece of history - an early copy of the Declaration of Independence known as the Southwick Broadside. Historian David Konig and curator Cassie Brand discuss the historical significance of the broadside, the process of conserving and displaying the document, and their hopes for the exhibition.