But recent findings have suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed.

VOA: special.2009.08.12

That works to the benefit of the ruling party. But recent polls show that ruling party is in trouble.

VOA: standard.2009.07.27

But recent reports showed U.S.consumer confidence dipping and consumer spending down as government subsidies to purchase new cars have ended and tax credits for first-time home buyers are soon to expire.

VOA: standard.2009.11.01

But recent legal documents have uncovered a slew of new evidence incriminating military officials and politicians, and helping to clarify the fates of many of the country's thousands of missing persons.

VOA: standard.2009.12.18

But recent statements by House Majority Leader Steny Hoyer have led some political observers to suggest that the White House and congressional Democrats may not be operating on the same timeline.

VOA: standard.2010.03.10

Polls showed Rubio trouncing Crist in the Republican primary, but recent polls give Crist a better chance to win the Senate seat running as an independent in November against Republican Rubio and Democratic candidate Kendrick Meek.

VOA: standard.2010.05.04

But recent public opinion polls show that a growing number of Americans disapprove of his handling of the health care issue, and that in turn has emboldened Republicans trying to block reform efforts in Congress.

VOA: standard.2009.09.02

But recent public opinion polls show him losing support within those groups and many experts say his ability to win back centrist voters could determine whether he will emerge victorious in the health care debate.

VOA: standard.2009.09.28

But in a recent study they declared that forty percent of the tweets captured over a two-week period were "pointless babble."

VOA: special.2009.09.14

But he agrees that in recent years, many companies have tied pay to short-term performance, instead of their long-term health.

VOA: special.2009.10.30

But a national survey found that in recent years foreign language teaching decreased in public elementary and middle schools.

VOA: special.2010.06.17

But there have also been efforts to bridge the differences between religious belief and evolutionary science in recent years.

VOA: special.2009.12.01

But a recent study shows that another treatment may have better results for patients who were not helped by drugs.

VOA: special.2010.03.02

But Arctic air has damaged some Florida oranges and strawberries in recent days, and killed fish at tropical fish farms.

VOA: special.2010.01.12

Such needle sticks are common. But a recent study found that medical students often fail to report them.

VOA: special.2010.02.10

The exact cause is unknown. But in a recent study, an experimental drug showed signs of halting the disorder in laboratory mice.

VOA: special.2010.05.19

But fewer camels than in the past were traded at a recent camel fair in Pushkar, in Rajasthan.

VOA: special.2009.01.13

But it said foreign language teaching in public elementary and middle schools dropped sharply in recent years.

VOA: special.2010.02.04

Children love them. But in recent years a lot of adults have found reason to love them,too.

VOA: special.2010.04.12