Charles Wortmann at the University of Nebraska-Lincoln says a one-time tillage may be used to correct a problem like aggressive weeds.

VOA: special.2010.09.28

Every week at this time, the Voice of America tells about popular words and expressions used in the United States.

VOA: special.2009.03.22

The researchers also found tools used by the Clovis culture, a group of human beings who lived at that time.

VOA: special.2009.01.20

A short time later,state soldiers were used to break up a strike by railroad workers in New York.

VOA: special.2010.06.10

She used the time in a hospital to write letters in support of an American Red Cross organization.

VOA: special.2009.07.26

At the time, the plant was used as packing material that protected other orchid plants arriving from Brazil.

VOA: special.2010.04.06

Edgar Allan Poe did something unusual for writers of his time: he used a narrator in a story to describe what was happening.

VOA: special.2009.02.02

A popular expression used at the time was MGM had "more stars than there are in heaven."

VOA: special.2009.05.31

At that time, both gold and silver were used to support the value of the American dollar.

VOA: special.2010.06.24

In the past, this expression was used as an argument to re-elect a president, especially during a time when the country was at war.

VOA: special.2009.07.12

It was used for the first time in December in a polio immunization campaign in Afghanistan.

VOA: special.2010.01.18

Most of the time these oils are used as food, especially in cooking.

VOA: special.2009.09.29

However,this is not the first time the mine has been used for science.

VOA: special.2009.07.21

"He was young and I had a very good time drawing his picture because I used a lot of reference material that were paintings made of him at different times in his life.

VOA: special.2009.02.27