But traditional guidelines say not to use tPA if more than three hours have passed after the first signs of a stroke.

VOA: special.2009.08.12

The top U.S.commander in Afghanistan, Army General Stanley McChrystal, has warned that the war with the Taliban could be lost if more troops are not deployed.

VOA: standard.2009.10.19

But if you are more interested in fast cars, here is a new turn in the world of motorsports.

VOA: special.2010.07.30

For example, a person was 20% more likely to feel happy if a friend living within 1.5 kilometers was also happy.

VOA: special.2009.01.21

The Securities and Exchange Commission says a private company must report financial information if it has five hundred shareholders or more.

VOA: special.2011.01.07

Soon,Barton recognized that many more lives could be saved if the men had medical help immediately after they were hurt.

VOA: special.2009.07.26

John Coates -- himself a former trader -- wondered if,over all, men with more testosterone made more successful traders.

VOA: special.2009.02.25

"If you're texting while driving, you are twenty-three times more likely to get into an accident than somebody who isn't.

VOA: special.2010.07.01

Stress is more likely to be harmful if you feel helpless to deal with the problem or situation that causes the stress.

VOA: special.2009.03.24

The Afghanistan policy calls for establishing security in cities and towns, protecting civilians even if it means more danger for coalition troops.

VOA: special.2010.06.26

Many people believed the depression would end if the government issued more paper money backed by silver.

VOA: special.2010.07.01

One showed that adults are much more cooperative if they work in a system based on rewards.

VOA: special.2009.10.21

But users are charged if they try to spend more than the amount available in their account.

VOA: special.2009.05.21

"If al-Shabab takes more and more control within Somalia, it is going to be exporting violence the way it just did in Uganda."

VOA: special.2010.07.17