Yesterday President Obama took to the international stage as he made his United Nations debut. From yesterday’s climate change summit to tomorrow’s nuclear disarmament talk — and anticipated flourishes from Iran's President Mahmoud Ahmadinejad and Libya's Muammar Gaddafi along the way — we take a look at President Obama’s global positioning with worldly thinkers Richard Wolffe and Reihan Salam. Richard Wolffe is a journalist and author of the bestselling book "Renegade: The Making of a President." Reihan Salam is a fellow at the New America Foundation and editor of The American Scene.

Watch the president's address to the United Nations:

This morning the finance committee of the U.S. House of Representatives kicks off a series of hearings on regulatory reform. Treasury Secretary Timothy Geithner will testify before Massachusetts Democratic Rep. Barney Frank's committee on a proposed revamping of the financial and consumer regulations. New York Times finance reporter Louise Story joins us with a look at the latest.

The NCAA released their college football rankings this week. There aren't too many surprises: Florida tops the list and Michigan didn't crack the top 25. But after their upset win over the USC Trojans, the Washington Huskies weigh in at number 24. Our sports contributor Ibrahim Abdul-Matin talks us through what it all means.

The investigation into a possible bomb plot involving three men in New York and Denver is reportedly widening to include at least a half-dozen individuals in the U.S., Pakistan and elsewhere. Meanwhile, federal counterterrorism authorities have alerted local police around the country about terrorists’ efforts to attack entertainment centers, hotels and stadiums. To discuss how best to secure a large American city like New York, and whether local and federal authorities are working together effectively, is Chris Dickey, Middle East regional editor for Newsweek and author of "Securing the City: Inside America’s Best Counterterror Force — The NYPD." We also speak to Lydia Khalil, a former counterterrorism analyst at the NYPD. She’s currently a fellow at the Council on Foreign Relations.

Scenes of Pittsburgh in "Flashdance."

You could say it's like the 1980s movie "Flashdance": It's set in Pittsburgh and the main character (the city) has shed its blue-collar threads for something more glamorous. This week "The Steel City" plays host to world leaders as the site of the G-20 economic summit. Pittsburgh Post-Gazette columnist Tony Norman has lived through the city’s ups and downs and responds as the world comes to his town.

New York Times food writer Kim Severson tells us about a series of food sites that apply the wikipedia approach to recipes. Wikia, Foodista and others allow anyone to post and edit all sorts of recipes, from cold curried crab soup to chicken parmesan. We also hear from Barnaby Dorfman, founder and CEO of Foodista. Call it the crowdsourcing of dinner.

We want your help with a recipe! Our dish is simple: a grilled cheese sandwich. But we want you to help us make it interesting.

Here's the initial recipe. What would you add to it, and how would you prepare it? Bonus points for outlandish ingredients! Let us know in the comments. We'll pull together your contributions and create a full listener-created recipe:

Ingredients:

• 2 slices of bread [please specify]
• 2 slices of cheese [please specify]
• [Add your extra ingredients below]

Preparation:

• Put the cheese between the bread
• Put the sandwich on a skillet
• Cook until both sides are brown.
• [Add your preparation suggestions below]

Chinese president Hu Jintao told the U.N. that climate change "has a profound impact on the survival and development of mankind," but stopped short of offering specifics on his country's plans to address the problem. Still, Chinese policy expert Taiya Smith tells us the speech is a big deal because it shows the country is moving away from pursuing development at all costs. That's good news for Henrik Fleischer, the CEO of energy technology firm Sargas, who tells about the bright future he sees for his carbon capture technology in the Chinese market. 

Takeaway sports contributor Ibrahim Abdul-Matin tells us about Major League Baseball's push to the playoffs, including a look at the wildest wild card races in the American League (Detroit, anyone?) and the National League.

Georgia and much of the Southeast is recuperating from the heavy rains and floods that destroyed homes and cars this week. Ten people have officially been reported dead because of the floods. Georgia Governor Sonny Perdue declared a state of emergency and has asked the federal government for assistance. For an update on the situation, we speak to Susanna Capelouto, news director for Georgia Public Broadcasting, and Angela Olson, whose house was damaged in the flooding.

Last week close to a million New Yorkers received a special edition of the New York Post emblazoned with the giant headline: "We're Screwed!" Plausible as the headline seemed, the paper was not the work of the Post staff, but rather an elaborate prank by The Yes Men, a group dedicated to pranking for change. We talk to one of the two Yes Men, Mike Bonnano (his partner-in-pranks, Andy Bichlbaum, would have joined us, but is still in jail after being arrested yesterday) about their goals, their pranks and their agenda for the week. We also talk to Steven Heller, co-chair of MFA design at the School for Visual Arts, about whether such pranks change conversations in a positive way or just distract from important topics.

For more from the Yes Men, check out their movie, The Yes Men Fix the World, which opens nationally on October 23rd, or read their book The Yes Men: The True Story of the End of the World Trade Organization.

Lately the Yes Men have been touting the benefits of a new product, the Survivaball. Click through for more videos from the Yes Men:

The BBC's Kate Clark joins us with a look at one aspect of the Taliban that you don't see that often: their day jobs. So-called "weekend Jihadists" are members of Afghan society — civil servants, office workers, even police officers — who spend their days at the office and join the Taliban on the weekends. These weekend warriors are blurring the lines between civilians and Taliban militants and complicating the fight for American troops under orders not to fire on civilians.