Scientists now know that two conditions make climbing at heights over eight thousand meters extremely difficult.

VOA: special.2010.06.30

But here is something that scientists now know: A team led by Professor Fu has reported the first genetic link to how much sleep we need.

VOA: special.2009.08.26

The Vatican has said that the pope did not now know that Williamson was a Holocaust denier when he lifted his excommunication on Jan.24.

VOA: standard.2009.03.12

"I expect him to address the German situation as he did the Irish and I'll bet you that you'll see some kind of language that will - using very papal rhetoric, acknowledge that the way the bishops were dealing with it in 1980 or thereabouts, when he was in that role, was we now know, not the best way."

VOA: standard.2010.04.01

Now we know that genetics makes this connection even deeper and we are linked to our ancestors by DNA.

VOA: special.2009.12.01

Now that we know about grapes and geography, we have some important tools for understanding the label on a bottle of wine.

VOA: special.2010.10.13

She says words and phrases like "guy" and "you know" now appear in research papers.

VOA: special.2010.01.28

what Matt would have done?" "How do you know "Now you're setting up a date with a vampire! What do you have, a death wish?"

VOA: special.2010.01.20

By now most parents know about the dangers of sex offenders using social networks.

VOA: special.2009.09.14

Whereas if you connect with them on LinkedIn, now I've got not only the person's name and contact information, but I know what their prior jobs were.

VOA: special.2009.09.14

Now,we admit that we do not know how this expression developed.

VOA: special.2009.06.28

Now I know where I'm at. I'm dealing with a couple of snakes. What I meant to say was that there is too much football and not enough education."

VOA: special.2009.07.19

Now,scientists know how these tiny pores tighten in plants.

VOA: special.2010.01.26

"When I was talking about knowing if my business is viable or not, through a profit-and-loss model, I was like 'Wow,I didn't even know the word viable before, and now I do.'

VOA: special.2011.06.30