That flooding and persistent power cuts sparked riots in the Pikine neighborhood where people barricaded roads with burned tires and smashed the windows of a police vehicle.

VOA: standard.2009.09.06

Lee Smith says it has always been hard for Americans to understand exactly why peace in the Middle East is so elusive, and why violence and terrorism are so pervasive and persistent in the Arab world.

VOA: standard.2010.03.18

That's the finding in a new study that analyzed over 750 published studies on children's health the findings were base on data from 50 years studies from children health, and health care disparities "Racial and ethnic disparities in children's health care are quite extensive, pervasive and persistent."

VOA: standard.2010.04.07

As the New York Times put it, he "struggled for much of his life with his weight,with alcohol and with persistent tales of womanizing."

VOA: special.2009.08.29

Co-author Andresse St.Rose says, for example,while girls earn high school math credits at the same rate as boys, the myth that girls aren't good at math is persistent and powerful.

VOA: standard.2010.03.26

But Sow says it's difficult to get adults to change, for example, to stop using pesticides on their tomatoes and other crops, which he says is a persistent problem in the village.

VOA: standard.2010.04.01

While women and minorities make up two-thirds of the American workforce, they represent less than The survey cites poor schools, and lack of quality science and math programs, persistent negative stereotypes, financial cost and school and workplace bias.

VOA: standard.2010.03.26

"Turkey's persistent denial and inability to face, or unwillingness to face up to its history is very disruptive in all kinds of ways - in terms of international relations, in terms of its own internal politics - and it also prevents it from really recognizing how do you deal with minorities."

VOA: standard.2010.03.19