But it was Darwin who identified and explained the process, natural selection, that causes life to evolve.

VOA: special.2009.02.25

The researchers believe that knowing the causes of loneliness could help in reducing it.

VOA: special.2009.12.22

It causes several billion dollars a year in agricultural losses around the world.

VOA: special.2009.10.20

Then,when the parasite enters the brain, it causes more serious problems.

VOA: special.2010.04.07

It causes an infection or swelling of the brain.

VOA: special.2009.05.26

Scientists don't know what causes it, but besides a genetic predisposition, they are now focusing on environmental exposure, or a combination of the two.

VOA: standard.2010.08.09

It causes debilitating fevers and is the number one killer of children in Africa.

VOA: standard.2010.04.23

"I think a solution to end this piracy, or to reduce it significantly, is possible and it should be done with cooperation of the local community, while at the same time addressing the root causes of the problem,".

VOA: standard.2009.10.30

"In Europe and also here increasingly in the U.S., they are talking as if we had basically lost it and the main question was talking to the Taliban and settling to some degree on their terms, whereas we still have not tried - and I think it would be worth trying for a year, at least,or two - to address the causes as to why the Taliban has become relatively popular, or at least relatively accepted,"

VOA: standard.2009.03.11