U.S.Ambassador Susan Rice, one of the sponsors of the resolution, said this fourth round of sanctions was warranted because Iran has not suspended its uranium enrichment activities but rather has increased its defiant behavior in recent months.

VOA: standard.2010.06.09

The Malaria Institute at Macha in southern Zambia is a living laboratory for the study of mosquito and human behavior.

VOA: special.2010.04.20

They have made over twenty movies and written many books and articles about the behavior of animals in the wild.

VOA: special.2011.03.23

"Dopamine is considered a neurotransmitter that is crucial for our ability to perceive rewards and to be motivated in our behavior."

VOA: special.2009.09.16

But she says there is much evidence that nicotine in tobacco smoke affects the nervous system, and child development and behavior.

VOA: special.2009.01.13

The researchers looked at the connections in two areas of the brain that control language and social behavior.

VOA: special.2010.12.21

To carry out the experiment, a team led by Kees Keizer set up several situations in public areas to test people's behavior.

VOA: special.2009.03.03

That can have a big effect on their behavior, helping them work harder and longer in therapy sessions.

VOA: special.2009.12.17

Three people who knew those in the photographs well also provided information about their personality and behavior.

VOA: special.2009.11.24

They say their findings show that even low levels of smoke may cause behavior problems in children with asthma or others at risk.

VOA: special.2009.01.13

It's a real piece about human behavior." Mary Surratt was a businesswoman in the eighteen-sixties.

VOA: special.2011.04.15

Her scientific research was published in the book "The Chimpanzees of Gombe: Patterns of Behavior."

VOA: special.2009.11.18

The Justice Department says domestic violence can be defined as a pattern of abusive behavior used by one partner in any relationship to control another partner.

VOA: special.2009.02.28

In all situations, people were more likely to violate the rules when there were nearby signs of disorderly behavior than if there were no signs of disorder.

VOA: special.2009.03.03