What's behind the shakeup in U.S. military command in Afghanistan and who's calling the shots on military strategy in Washington? We'll speak with Dr. Kalev Sepp, professor at the Naval Post Graduate School in Monterrey, California. He was the Iraq Study Group's military expert and until 2009 he served as the Deputy Assistant Secretary of Defense for Special Operations Capabilities.

Cockpit voice recordings reveal that 24 year-old first officer Rebecca Shaw had never experienced icy conditions in flight and seemed unaware that the plane she was co-piloting was facing those conditions. We take a look at three days of National Transportation Safety Board hearings into the February crash of Continental Connection flight 3407 near Buffalo. Former NTSB chairman Jim Hall tells us what he thinks needs to be done to ensure safer skies.

House Speaker Nancy Pelosi spoke with reporters today, and hit back hard against allegations by Republicans that she was trying to cover up what she knew about the waterboarding of terror suspects. We speak with ABC senior political reporter, Rick Klein.

India's marathon election cycle is over but the results won't be announced until Saturday. We speak to the BBC's George Arney in New Delhi, who just completed a 5-thousand mile train trip around the country during the month-long voting period.

The newest Star Trek movie is a box office hit despite one notable absence: the Klingons. The long time villains of the Star Trek series speak their own language created by Berkeley educated linguist Marc Okrand. We speak with Marc about the process of inventing an alien language for Hollywood.