News that Dubai World, the state-owned investment arm of Dubai, may need to delay debt repayment is reverberating around the world. The BBC's Mark Gregory joins us from London with the latest.

How did Tareq and Michaele Salahi make their way uninvited into a White House state dinner this week? We talk with Roxanne Roberts, who broke the story for the Washington Post, about the latest developments in what may be the most famous party crashing of all time.

We look at some of the week's big sports stories with Bill Littlefield, host of NPR's "Only A Game."

Synesthesia is a rare neurological condition that causes senses to conflate — for example some ’synesthetes’ see colors when they hear music or taste certain foods. We revisit a conversation we had with Sean Day, who has synesthesia and is President of the American Synesthesia Association and neurologist Dr. Richard Cytowic, who co-authored the book “Wednesday is Indigo Blue: Discovering the Brain of Synesthesia.”