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

They found that over a period of six years, planting three rows of trees reduced total dust and ammonia by more than half.

VOA: special.2009.09.08

Only half returned. The battle of Gettysburg was over.

VOA: special.2009.11.05

All had undergone surgery. Among the 202 patients over the age of 75, exactly half also received what's called adjuvant, or supplemental,chemotherapy.

VOA: standard.2010.03.18

The island population is estimated by the UN at over half a million, with an equal number of Cape Verdeans living abroad.

VOA: standard.2009.06.04

The Iraq surge involved about 20,000 U.S.combat troops over a period of a year and a half.

VOA: standard.2009.11.04

So over two and a half times the food that is delivered in the form of aid, is actually thrown away here in Japan.

VOA: standard.2009.09.09

"They land over there for half an hour,". "I feel a lot of the flash of the cameras that a lot of people come and they pictures me and feel the flash of the cameras."

VOA: standard.2009.07.28

"More alarmingly,WHO estimates if the combined effect of decreased financial and political commitment were to be sustained or continued, this could result to a return of a half a million measles deaths each year by 2012, wiping out the gains made over the past 18 years."

VOA: standard.2010.05.21