World: Ginger Thompson takes a look at how American law enforcment is infiltrating Mexican drug cartels, often blurring the line between what is permissible and ethical when U.S. forces operate in a foreign land. The main section has more on the results of Tunisia's first elections and Turkey's continued efforts to rescue earthquake survivors.

U.S.: Mitt Romney changed his debate strategy from 2008 (less rehearsal, more relaxation and ad-libing) and it seems to be paying off. President Obama's new 2012 wrinkle? He's on Tumblr now.

Business / Technology: Why does your savings account pay you almost nothing in interest? Because banks don't want your money. They say they have more on deposit then they can lend out, which means they're actually having trouble cashing in on all that cash. In other news: Forget those obnoxious Bluetooth headseats. Your phone will soon be in your shirt. You'll need it too, because all those iPads are overwhelming free public wi-fi.

Science: Worrisome parents now have something new to fret over: The "app gap." Half of families with incomes above $75,000/year have downloaded mobile educational apps for their young children, compared to only one in eight poor families. Never mind that kids under eight are spending more time than ever (and way more than recommended) in front of glowing screens. Nature and photography lovers marveled at some amazing images of the beautiful nautilus, but may not have read the story explaining how the cephalopod has become endangered by humans and their insatiable desire for pretty shells. Finally, a new study questions, once again, the true value of regular mammograms.

Sports: Songwriter Paul Leka passed away at age 68. Why is this in sports? He wrote the chorus for "Kiss Him Goodbye." (You know, the "Na Na Na, Hey Hey Hey" song used to taunt a departing foe?)

Style: Coming to the Styles Section on Thursday, and a wedding hall near you next spring: black wedding dresses, courtesy of leading designer Vera Wang.

Arts: Two new books about Charles Dickens have hit shelves, nerd hero Joss Whedon made a to-do by filming an entire production of "Much Ado About Nothing" without telling anyone, and are you ready for the Korean (pop music) invasion?