A new study finds that “unhappy” cities in the U.S. may include many that might be expected – declining Rust Belt cities, for example – but many “happy” cities have similar economic attributes: low wages and low housing costs. What are the differences? Plus, GM says its victim compensation fund will be paid for out-of-pocket, not through liability insurance. Which made us wonder, what is liability insurance? What does it cover? Are there good and bad times to draw on it? We’ll explain. Also, today Marketplace’s Sustainability Desk kicks off a brand new series called “We Used to be China.” Our reporters are digging not only into China’s air pollution crisis….but looking back at our own.  And one thread they found running through the fight for clean air here in the U.S….…. WOMEN.  Not the  “ladies who lunch,”  exactly…but the ladies who club…and organize. And after, the smell of petrol. The sound of revving internal combustion engines. There are certain experiences common to all types of motor sport around the world. But later this year, racing fans will be presented with an alternative, when the Formula E world championship – designed exclusively for electric cars – is launched. The cars recently took to the track in anger for the first time, at the Donington Park circuit in Britain. The BBC’s – Theo Leggett – a confirmed petrol head – went along to find out more.