Scientists have long believed that Earth's satellite lacks the ability to hold water near its surface because it has no atmosphere.

VOA: special.2009.09.30

Scientists have long known that giant pandas mainly eat just one kind of plant: bamboo.

VOA: special.2010.01.19

Farmers and gardeners have long used greenhouses to extend the growing season in cold weather.

VOA: special.2009.12.22

Medical experts have long recognized the work of the Mayo Clinic in Rochester,Minnesota.

VOA: special.2010.03.30

Scientists have long known that DNA includes different amounts of four chemical bases.

VOA: special.2010.03.23

Spices have long been used to keep food safe to eat.

VOA: special.2010.06.01

Researchers have long known that bone marrow produces and contains monocytes.

VOA: special.2009.08.25

Health experts have long noted the importance of physical activity.

VOA: special.2010.06.08

Sports have long been part of popular culture.

VOA: special.2011.04.12

The wrestlers have long-standing conflicts with each other.

VOA: special.2010.02.19

Evocative symbols of Europe's troubled past,such as the swastika, have long been illegal in a number of countries across the continent.

VOA: standard.2009.12.16

Economists have long assumed that job creation would lag behind overall improvement of economic conditions in the United States.

VOA: standard.2010.05.20

Economists have long considered government spending, especially on infrastructure, to be an effective tool for revitalizing a stagnating economy.

VOA: standard.2009.10.16

The U.S.and other Western nations have long imposed sanctions on the government, which he says have not worked.

VOA: standard.2009.08.14