Bio-markers help researchers know what is happening in the bodies of people with a disease or medical condition.

VOA: special.2011.08.02

He is a leader in the sign-making industry - a real big gun,if you know what I mean.

VOA: special.2010.11.28

A navigator needs to know what time it is on his ship and also the time at another place of known longitude -- at the very same moment.

VOA: special.2010.07.14

Ella wants to know what it means to "eighty-six" something.

VOA: special.2010.01.08

"To those leaders around the globe who seek to sow conflict, or blame their society's ills on the West - know that your people will judge you on what you can build, not what you destroy.

VOA: special.2009.01.24

ERIC: Yeah. Hey! - La Push, baby. You in?- Should I know what that means?

VOA: standard.other

"To be honest with you, it's probably been a lot better because I don't know what this site would have been like with 6- or 8,000 more people.

VOA: standard.2010.02.16

What he does not know, but is about to learn, is that he is a demi-god: the child of a human mother and a god and not just any god.

VOA: standard.2010.04.08

"Greeks just simply do not know what the next day will spell for them, what this EU-IMF rescue package is all about, what it will actually mean for their pockets."

VOA: standard.2010.04.28

"Even when we know the result of the election, we may not know what the result is in terms of government -- who will successfully make a deal with who to form what sort of government."

VOA: standard.2010.05.05

He says finding that out will be crucial. "Whether this was an act of terrorism conducted by al-Qaida central or that of a lone wolf acting independently, we will have to wait and see for the investigation and what comes out of that, but we do know that al-Qaida and their affiliates have a crazed obsession in targeting the aviation industry,"

VOA: standard.2009.12.27