But researcher Ellen Bialystock says it probably does make you better at certain skills.

VOA: special.2011.03.09

But we are not going to know for certain which approach makes sense until additional data is in."

VOA: standard.2010.07.16

But in certain landfills, including some accepting the BP cleanup, waste,heat and methane gas produced by decomposition are being used to generate energy.

VOA: standard.2010.08.05

The Georgian spokesman says he cannot be 100 percent certain about Russia's involvement,but notes that an investigation of specific involvement of Russian special services is underway.

VOA: standard.2009.05.05

But Dr.Martin says the long-term effectiveness of certain heart catheterization procedures is unclear.

VOA: standard.2010.01.01

Pinheiro says it is almost certain the court will find Aung San Suu Kyi guilty, but would likely put her back under house arrest rather than prison.

VOA: standard.2009.06.19

It's sort of an intimate thing,you know. It's the dichotomy of having comfort in singing about certain things or saying things within a song, but then elaborating further seems difficult for me."

VOA: standard.2009.04.19

But could find none. "Over time oil does dissipate and can get broken down from bacteria and other organisms in the water, but still they are putting certain dispersants on the oil that makes it sink down to the bottom."

VOA: standard.2010.05.09

"A sense that a step is made to release prisoners, and the government is trying to build some bridges in certain areas, but at the same time, the revolutionary side is given its moment in which Fidel Castro is able to excoriate the United States and to continue to lay out the revolutionary credentials, or Cuba's role as a leader of the Third World."

VOA: standard.2010.07.13