UPDATED 7:40 p.m.

We’re readjusting our plans for tomorrow’s show in response to a bunch of news that’s recently broken. First, BP says they will begin to implement a “top kill” approach first thing tomorrow morning. This is basically a technique where large amounts of heavy drilling mud and cement will be pumped through the ocean into the blowout preventer in hopes of capping the leak. It’s a risky approach that’s been done on land but never at 5,000 feet below water. And if it doesn’t go exactly right, it could make things worse. We’ll get an update from the ground and talk with an engineer about how exactly this technology works.

Then, just a couple of hours ago, we learned that President Obama will be sending up to 1,200 National Guard troops to the Southwest border, after demands from both Republicans and Democrats that the security along the border be tightened. Washington Correspondent Todd Zwillich will join us in the morning to talk about the internal political dynamics that led to this decision.

And 100 years after Mark Twain’s death, his autobiography is set to be published this fall. Twain once wrote, “It is no use to keep private information which you can’t show off.” Soon his most private information will be made public.  We’ll talk with the general editor of the Mark Twain Project and the publications editor at The Mark Twain House about what secrets we may soon learn about the literary legend.

Finally, at the end of the week, we’re hoping to answer listeners’ questions when it comes to the oil spill. We’ve gotten a slew of inquiries from Facebook, via text messages, on our website and through our phones lines (1-877-8-MYTAKE) asking a range of questions regarding the spill and cleanup efforts. We’re going to invite on an oil expert to help us sift through your comments and give you some answers. So continue sending your questions our way.

Anna Sale here on the dayshift.

The tensions between North and South Korea are going from bad to worse today. The South Korean president said he again considers North Korea its "principal enemy," which prompted North Korea to cut the remaining diplomatic ties with South Korea. This all comes as Secretary of State Hillary Clinton prepares to visit South Korea later this week. We'll look tomorrow at where all this might lead, with military thinkers and scholars who have thought about how what might happen in a worst case scenario if the two countries go to war. We're asking what war games have predicted, and what the role of the United States and China might be.

It was also clear early this morning that volatile global markets were once again going to be a big story, as the Dow dropped below 10,000 on renewed global debt fears. This comes at the same time that Takeaway and WNYC economics editor Charlie Herman has been crunching the most recent housing data. We'll look at all these indicators tomorrow, break apart which ones are leading indicators that suggest where we're going and what the lagging indicators say about where we've been. The big question, of course, is whether all this market volatility means larger economic instability.

We'll also look tomorrow at the impact of the Clinton administration's "Moving to Opportunity" program. It relocated families from urban public housing to regions with lower poverty rates. A new book finds that it had mixed results for young people and it breaks down along the gender line. We'll get the details from Sue Popkin, one of the researchers behind the book "Moving to Opportunity: The Story of an American Experiment to End Ghetto Poverty," and a woman who moved from New York to North Carolina with her three kids as part of the program. We're also starting this conversation online today and asking for your personal stories. When have you moved for the sake of opportunity? How did it affect your life?