Before it became China's capital in 1949, Beijing was a fairly provincial little city of 2 million people.
Today, it has grown into a megalopolis of some 18 million people.
I've recently returned to the city after a few years away, the first thing that strikes me is: Who the heck are all of these 20-somethings and how did they get to be driving all these Ferraris and Maseratis?
Pinto leads protesters in song during anti-austerity demonstrations. "I'm just a normal citizen," she says. "I just have this strong instinct of protecting what I love, and I do deeply love my country."
Credit Courtesy of Ana Maria Pinto
Pinto conducts members of the Intervention Choir of Porto, a choral group she founded to use music as a form of nonviolent civil disobedience. They perform at protests nationwide.
Juan Pablo Gonzalez, a science and math teacher in San Diego, posted an offer to teach urban planting, including hydroponic techniques. He and his wife were inspired by the site and offered to help by translating it into Spanish.
Credit Courtesy of Juan Pablo Gonzalez
Tallinn, Estonia is a high-tech city that is home to Skype as well as the Bank of Happiness, an online marketplace to share good deeds.
Credit Mundus Gregorius / flickr
Ryan Iverson of Lebanon, Ore., turned to the Bank of Happiness for assistance with writing a grant proposal related to a type of stove he designed. It's made from recycled propane tanks, which are costly to prepare safely.
Credit Courtesy of Ryan Iverson
Veronika Davel, a pizza maker in Tallinn, Estonia, has offered to teach English lessons and has sought companions for a bike tour.