More than 40 heads of state are gathering in Washington today for President Obama's two-day meeting on nuclear threats. But little is expected to come out of the meeting, in part because some subjects, such as nuclear tensions between India and Pakistan and Iran's nuclear program, will not be discussed in the main summit. We speak with nuclear security expert and Harvard University professor Matthew Bunn.

Soraya Sarhaddi Nelson, recently honored with a Peabody Award, talks about her reporting.

Investigators in Russia say human error may be to blame in the plane crash that killed the Polish president and 95 others. Duncan Kennedy of BBC joins us from Warsaw.

Torry Anne Hansen of Shelbyville, Tennessee says her 7-year-old son, adopted from Russia, has "severe psychopathic issues," and that she was lied to by the Russian adoption agency about the boy's mental condition. Last week she put him on a plane back to Moscow, alone, with only a note explaining her decision. The case has sparked outrage in Russia and officials there are calling for a suspension of all adoptions by U.S. families. We speak with Clifford Levy, who reports for The New York Times from Moscow.

It's a Bible for the 21st century told in the form of the Japanese comic style known as manga. We revisit a conversation with Agibayo Akinsiku, the Nigerian-born British creator of the book “The Manga Bible: From Genesis to Revelation.”

• Sigur Ros, "Nybatteri"
• Air, "Mike Mills"
• Joe Jackson, "Steppin' Out"
• Ahmad Jamal, "Patterns"
• Dntel, "Last Songs"
• Christian McBride, "Brother Mister"