«The currency that matters most is not measured in dollars and cents, but in the opinions of others. Putting this principle into practice can help us make the world a better place, or at least make California’s dwindling water supply last just a little bit longer…»
- Texto completo en http://www.nytimes.com/2015/05/17/opinion/sunday/how-to-get-people-to-pitch-in.html?_r=0
