In nineteen eighty-two, American researchers James Wilson and George Kelling wrote a report describing what they called the broken windows theory.

VOA: special.2009.03.03

Three were plant-eaters. They were the western horse, the ancient bison and a two-meter tall animal called the Harlan's ground sloth.

VOA: special.2010.04.07

A week later, he pleaded guilty to a charge of leaving an accident and was given a two-month suspended sentence.

VOA: special.2009.09.13

The number of students taken to hospitals increased one and a half times from nineteen ninety-seven to two thousand seven.

VOA: special.2009.08.13

The union collected the notes on a board twenty-three meters wide by almost two and a half meters tall.

VOA: special.2010.04.30

It can do this between sunrise and noon on a clear day with an average outside temperature of thirty-two degrees Celsius.

VOA: special.2009.04.20

And,all cooking in the kitchen is done with only two hot water boilers for pasta and a wood-burning oven.

VOA: special.2009.04.10

Ten years later,in nineteen seventy-two, an engineer named Nolan Bushnell and a programmer,Ted Dabney, started the Atari company in California.

VOA: special.2011.02.23

No future president would be safe, they said, if opposed by a majority of the House and two-thirds of the Senate.

VOA: special.2010.01.28

And even in the conservative grain-farming states, two hundred thousand farmers joined a group that called for major economic changes.

VOA: special.2010.12.09

And some lower-paying jobs require only two years of college, or even a technical education program in high school.

VOA: special.2009.10.15

People walked thirty-two kilometers a day for three days to increase public awareness and raise money to fight breast cancer.

VOA: special.2009.11.02

It has a study program currently available to college graduates in twenty-two countries in Asia, Africa and Latin America.

VOA: special.2009.09.24

The Fulbright Teacher and Administrator Exchange Program offers a true exchange -- meaning two people trade jobs for a time.

VOA: special.2009.02.12