He says that, when researchers changed the magnetic field, the butterflies were no longer able to find their way.

VOA: special.2010.04.27

Anti-doping officials say they want to protect the integrity of sports by guaranteeing what they call a level playing field.

VOA: special.2011.04.12

The group says this was the first time it gave a documentary crew unrestricted access to its field operations.

VOA: special.2010.07.26

USA Track and Field Hall of Famer, Bill Bowerman, is credited with bringing jogging to the United States in the nineteen seventies.

VOA: special.2010.06.08

The discovery of the largest oil and gas field in North America led to the Alaska Pipeline.

VOA: special.2009.03.02

Lincoln himself said his purpose was to provide "an open field and a fair chance in life."

VOA: special.2009.02.09

Visitors can also find a link to the Fort Raleigh National Historic Site, with information about a free electronic field trip for students.

VOA: special.2009.08.17

But only a few schools offer experience in traditional hands-on field work in addition to classes.

VOA: special.2009.04.14

He decided to make his headquarters in the field with the Army of the Potomac.

VOA: special.2009.11.26

"My experience and other doctors in the field talk about the holistic, comprehensive care that's required to treat a fibromyalgia patient, and that requires time.

VOA: special.2011.07.26

Still,she says, far more boys than girls join sports teams nearly forty years after Title Nine gave girls a chance to level the playing field.

VOA: special.2010.03.04

Food and guns were difficult to find to keep the Confederate armies in the field.

VOA: special.2009.10.22

In nineteen thirty-four it was still rare to have lighting in a baseball field.

VOA: special.2009.03.23

Some students get jobs in the field they hope to enter after college.

VOA: special.2010.06.18