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

Mister Miller says that what matters most is not whether the rank of cities changes over the years.

VOA: special.2009.03.27

Throughout most of the eighteen fifties, war was a continual threat between the North and the South over the issue of slavery.

VOA: special.2009.06.18

She said what surprises them most is when she states firmly that the Civil War was,in fact, about the fight over slavery.

VOA: special.2011.04.15

Over the past two years, he has become one of the most famous men in the world.

VOA: special.2009.01.16

England,where the sport was born, has the most football clubs - over forty-two thousand.

VOA: special.2010.06.09

At the time, most safety belts in cars crossed the body over the abdomen.

VOA: special.2010.02.09

At the time,most safety belts in cars crossed the body over the abdomen.

VOA: special.2011.03.01

Over the years,radio has become one of the most important forms of communication.

VOA: special.2010.01.31

It says the disease is most common in Caucasian women over age fifty.

VOA: special.2010.08.31

The most Miami could offer him was ninety-six million dollars over five years.

VOA: special.2010.08.06

Most of the planet's evaporation and precipitation take place over oceans.

VOA: special.2011.06.22

Most of that is coming from Vietnam. The highest year that the US shipped rice, over these last 10 years,was in 2004;

VOA: standard.2010.07.29

The song was a million-selling hit on the R&B charts in the 1960s, and over the years, it became Taylor's most-requested show tune.

VOA: standard.2009.06.18