This is called rotational grazing, and we received a question from Zhang Guohui in China about how it works.

VOA: special.2009.01.06

This is called an indirect method because the ink is put on the cut form before it goes on the paper.

VOA: special.2009.09.02

It is called "Caramelos". Cruz tells about a candy seller singing in the streets about his delicious goods.

VOA: special.2011.05.08

Clay becomes very hard when it is put in a fire or a special oven called a kiln.

VOA: special.2009.01.12

Little Delaware is called the First State because it was the first state the first to approve the new United States Constitution.

VOA: special.2009.08.02

It is the band's seventh studio album and the first without LeRoi Moore whom they called "GrooGrux King."

VOA: special.2009.08.28

It is estimated that more than 2,500,000 people worldwide suffer from multiple sclerosis, which also is called MS.

VOA: special.2009.01.06

If he misses the shot and one his teammates is able to regain control of the ball, it is called an "offensive rebound."

VOA: special.2011.03.25

Carbon monoxide is called the silent killer because people do not know it is in the air.

VOA: special.2010.02.02

This is one of the reasons it was chosen for the genetic map, also called a genome.

VOA: special.2010.06.29

So it is not surprising that Las Vegas is called The Gambling Capital of the World and The Entertainment Capital of the World.

VOA: special.2010.03.14

A male is called a steer if it had its reproductive organs removed as a calf.

VOA: special.2009.07.21

It is called the "Sacred Heart of Healing" and was made by the artist Tim Tate.

VOA: special.2009.09.16

It is also called the City of Angels because Los Angeles means "the angels" in Spanish.

VOA: special.2010.01.03