Terry Gross

Sixty-eight percent of all web searches take place on Google.com. But as journalist Randall Stross found when researching his new book, Planet Google: One Company's Audacious Plan to Organize Everything We Know, the company's business extends well beyond basic web searches.

CNN's chief international correspondent, Christiane Amanpour has covered every major international and humanitarian crisis since the Gulf War. Her new documentary, Scream Bloody Murder, is about genocide — and the people who are working to end mass killing worldwide.

Conservative Christian Richard Cizik preaches the message of environmentalism from a pro-life perspective. Cizik is the vice president for governmental affairs of the National Association of Evangelicals, a powerful lobbying organization that represents 45,000 churches.