ISIS is believed to get revenue from selling oil on the black market from fields it’s captured. We look at the black market for oil and how it works. Plus, advertising on Twitter is such an impenetrable mystery that Twitter is giving away free classes to teach vendors how to promote their stuff via its platform. The program is called #flightschool. We explain how it works and what it’s gonna teach. Also, two new studies indicate that immigrants to the U.S. weathered the recent housing slump better than native-born Americans and are also rapidly closing the gap on home ownership rates. We look at why immigrants are doing so well and what it means.