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A photo of a car key in an ignition. - 

In light of the airline tragedy in Ukraine, a look why there isn't a simple list of no-fly zones over world hot spots. Plus, what cap and trade has to do with acid rain. And finally, most people tend to ignore pop up ads, but a new study looks at what kind of ads perform better than others

Follow David Brancaccio at @DavidBrancaccio