He is also working on a similar literacy study for cities around the world.

VOA: special.2009.03.27

Other cities around the world also began to use this crime-fighting method.

VOA: special.2009.03.03

And since it's a global problem,he adds, it will always be helpful for cities around the world to exchange ideas and experiences to benefit from each other's innovative solutions.

VOA: standard.2010.07.26

Their study considers painting sixty-three percent of rooftops white in one hundred large cities in warm areas around the world.

VOA: special.2009.06.19

Those cities and others around the world,he says, can learn from the top-ranked city on the list: Stockholm,Sweden.

VOA: standard.2010.07.26