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In the end, it's an argument about competence.

The Obama administration's response to the Sept. 11 killings at the U.S. Consulate in Benghazi, Libya, has become a staple of the campaign. It's bound to come up again during Monday's debate about foreign policy.

Mitt Romney will use the event — which left four Americans dead, including Ambassador Chris Stevens — to question President Obama's veracity and his handling of foreign policy in general.

On-air challenge: You will be given two words. Change one letter in each of them to make two new words that name things that are in the same category. (Hint: In each pair, the letter that you change to — that is, the new letter — is the same in each pair.) For example, given the words "poked" and "tummy," the answer would be "poker" and "rummy."

Apples — right off the tree, baked in a pie, pressed into cider or mashed into sauce — are a basic element of American culture. October is the month to celebrate them, thanks, in part, to Johnny Appleseed.

You've probably heard of the legendary character who traveled the Midwest planting trees, but he's not a myth. Johnny Appleseed's real name was John Chapman, and he was born in Massachusetts in either 1774 or 1775.

Host Guy Raz speaks with NPR's Don Gonyea, who has just spent two weeks on the campaign trail. Along the way, he met some undecided voters. In swing states, undecided voters are being bombarded by advertising, and Gonyea explains what is keeping them from making up their minds.