They say their findings offer one reason why the custom of cursing may have continued for so long.

VOA: special.2009.08.18

People can't afford them. That's why we don't really have a malaria vaccine yet, because no one in rich countries really suffers from malaria.

VOA: special.2010.03.29

And the kind of sedentary lifestyle that we lead, are one of the reasons why we have every day the number of obese people in India increasing."

VOA: special.2010.05.12

"You can imagine the impact that this would have on whole communities throughout the country and why there would be such passions that have been passed on from generation to generation even at the remove of one hundred fifty years."

VOA: special.2011.04.09

So that's the main reason why we have the Heron there." Israel is one of the pioneers of combat drones, having used the remote-controlled aircraft in Lebanon and the Palestinian territories.

VOA: standard.2010.07.27

I'm not going to give it all the credit, but maybe that was one of the reasons why I was able to come back so strong for the team pursuit and have a medal hanging around my neck today."

VOA: standard.2010.02.28