Studies have shown that over time, most humans need eight to eight and a half hours of sleep for the best health.

VOA: special.2009.08.26

Miz Mead began her studies of cultures in an unusual way for a woman of her time.

VOA: special.2010.01.17

Also,studies have shown that women are better than men in repaying their loans on time.

VOA: special.2010.06.16

Mister Lowell's theories were based on what were serious scientific studies of that time.

VOA: special.2010.07.11

In time,Helen did go to college and completed her studies with high honors.

VOA: special.2009.11.15

She says the new studies are important because they show trends over time.

VOA: special.2010.03.04

They said she did not spend enough time on comparative studies.

VOA: special.2010.01.17

Paul had little time left for his studies.

VOA: special.2009.04.11

Studies show a link between time on a computer or in front of a TV and obesity.

VOA: standard.2010.07.02

As for sightseeing, there's little time for that during their studies at the Olympics, but the students are welcome to stay for a bit on their own afterwards - if,of course, they are not worn out.

VOA: standard.2010.02.26

Army War College National Security Studies professor Larry Goodson says the U.S.-Karzai relationship has been souring for some time, but that,in his opinion, the Obama team has not been able to formulate any alternative to Hamid Karzai.

VOA: standard.2009.08.03