In Europe and elsewhere, governments are using ideas from the new science of well-being to try to make citizens more content. Will America follow their lead?
Dhaka, Bangladesh: Momin Mohammad, a leather worker, brushes his teeth by a canal near his home in the city's polluted Hazaribagh neighborhood. Each day, tanneries dump 22,000 liters of toxic waste into the Buriganga, the capital city's main river and key water supply.