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 first heart I made was when my mother was extremely ill and after she passed away I made the heart larger.

VOA: special.2009.09.16

This is the first time scientists have successfully passed on a foreign gene to a future generation.

VOA: special.2009.06.23

Southern supporters were afraid that if a statehood bill for California was passed first, then northerners would refuse to pass the other parts of the compromise.

VOA: special.2009.04.02

Lincoln noted that seventy-two years had passed since the first president was inaugurated.

VOA: special.2009.07.30

The first troop train from the North passed through Baltimore,Maryland, without incident.

VOA: special.2009.08.20

It's the first-ever decision engine. From Microsoft." A Web traffic report last Friday from StatCounter said Bing twice passed Yahoo in usage in the United States in its first few weeks.

VOA: special.2009.07.17

And last June,says Sittenfeld, the House passed the American Clean Energy and Security Act, the first bill out of either chamber of Congress to directly take on the challenge of global warming.

VOA: standard.2010.02.25

In the first 51 days of this president, the administration has passed a series of really dramatic moves: the biggest financial rescue package that we have seen in decades, the largest stimulus in the history of the country, the biggest home foreclosure prevention and mortgage assistance program since the Depression."

VOA: standard.2009.03.15