Researchers have increasingly tried to use these biomarkers to identify people who are at high risk of developing heart disease.

VOA: special.2009.07.15

She did not dare to look down and tried to forget that her fingers hurt and her feet were bleeding.

VOA: special.2010.04.03

The Ecuadorian government has tried to enforce severe limits on the number of Ecuadorians who move to the islands.

VOA: special.2009.12.16

The Army of the Potomac the strongest of the Union armies had tried to seize Richmond, the Confederate capital.

VOA: special.2009.09.24

The German Army chief, General Erich Ludendorff, tried to capture the French capital without waiting to strengthen his forces.

VOA: special.2010.10.21

He became a "free agent." For months,sports fans had tried to predict where the star would choose to play.

VOA: special.2010.08.06

Girls screamed as they tried to get a look at John Lennon, Paul McCartney, George Harrison and Ringo Starr.

VOA: special.2010.07.30

President Pierce had tried to unite the different groups in the party by giving each a representative in his cabinet.

VOA: special.2009.05.14

Virginians wanted Brown punished quickly to show what would happen to anyone who tried to lead a Negro rebellion.

VOA: special.2009.07.02

President Truman tried to stop the increases through a special price control agency that had been created during the war.

VOA: special.2011.08.11

It was the same town where abolitionist John Brown had tried to start a slave rebellion a few years before.

VOA: special.2009.08.20

He also tried hypnosis. He wanted to see if putting patients into a sleep-like condition would help ease troubled minds.

VOA: special.2010.04.13

He was forty years old. Over the years,historians and medical experts have tried to explain the cause of Poe's death.

VOA: special.2009.02.02

"I always tried to get like the coolest ones, like the Pokeman ones and trying to give them out to everybody.

VOA: special.2010.02.08