It really comes in handy

I was at the quarterly meeting of my investment club today and our hostess is Orthodox Jewish.  The topic of carrying during the Sabbath ("what about your children?  Can you carry them?") came up and so my friend was explaining that some Jewish communities create what she described as a sort of fence to enclose, say a neighborhood, and make carrying acceptable within that space.

"Oh," I said, "an eruv?"

My friend's jaw dropped and she said "You know that?!"

Her equally stunned husband said "How do you know that?"

"Public radio." 

"Huh," said the husband, "maybe they shouldn't be defunded."