Secretary of Education Arne Duncan testifies before Congress today to pitch Pres. Obama's plan to re-write the No Child Left Behind law. Out is the demand that students be proficient in math and reading by 2012. Instead, the president's goal is to have all students graduate high school and be ready for college by 2020. Critics say there's still too much emphasis on testing and too much responsibility placed on teachers. Diane Ravitch of New York University tells us why she went from testing advocate under the first President Bush to NCLB critic.

Anti-American cleric Moktada al-Sadr is blamed for some of the worst sectarian violence in Iraq. Now his followers have emerged as one of the most powerful Shiite blocs after Iraq's March 7 parliamentary elections. We look at the resurgence of al-Sadr and other election results with the BBC's Andrew North in Iraq.

A dozen years ago, the Good Friday agreement put an end to decades of civil war in Northern Ireland. So why are there more walls dividing Belfast neighborhoods than there were in 1998. Kevin Cullen, Boston Globe columnist and long-time observer of Northern Ireland, takes stock.

Harvard evolutionary psychologist Deidre Barrett says that the instincts humans developed hundreds of years ago to survive still govern today. But nowadays those instincts cause overindulgence in things like salt and sugar, as well as behaviors such as watching television at the expense of human relationships. We talk to her about her book "Supernormal Stimuli: How Primal Urges Overran Their Evolutionary Purpose."

• The Pixies, "Havelina"
• Mike Mills, "Air"
• Dublin Gulch, "My Darling Asleep"
• Maserati, "Wires Were Towers"
• Adam Niewood “Stimuli”