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

Today,Miz Goodall spends most of her time traveling around the world speaking about wildlife protection and working to build support for her foundation.

VOA: special.2009.11.18

Clark sees traffic congestion as one of the most serious problems of our time - for a variety of reasons.

VOA: standard.2010.07.26

It has kept the NLD leader, Aung San Suu Kyi,locked up for most of the time since.

VOA: standard.2009.09.24

Terribly dynamic and largely a very young group of players who are going to be competing in the Olympics most of them for the first time,"

VOA: standard.2010.01.12

They have kept her locked up for most of the time since.

VOA: standard.2009.11.02

Clinton said the United States continues to demand the unconditional release of the Nobel Peace laureate, who has been detained most of the time since 1990, when her National League for Democracy party won national elections but was barred by the military from taking power.

VOA: standard.2009.11.12