He says his team's research is influenced by questions in evolutionary biology about why people and groups use costly punishment.

VOA: special.2009.03.03

Here Gregory Anderson talks about why languages are important: "Language is in many ways, a window to the mind.

VOA: special.2009.12.02

Natural selection does not explain everything about why species evolve.

VOA: special.2009.02.25

Mr.Brown's spokesperson said the Prime Minister was keen to "state the case" about why Britain was right to take action in Iraq.

VOA: standard.2010.01.22

In 2008,Wilson talked to VOA about why he decided to take action.

VOA: standard.2010.02.11

(Sound) One well-known young opposition activist, Mohammed Reza Jalaiepour, who was later arrested by the government, placed this emotional confession about why he joined the opposition on Mousavi's Facebook Web site.

VOA: standard.2009.11.14

Some U.S.legislators are demanding answers about why Hasan's intercepted communications with the radical cleric did not prompt wider scrutiny of the psychiatrist's actions or intervention that could have prevented the attack.

VOA: standard.2009.11.10

Join us as we learn about the cultural value of language and why endangered languages must be protected.

VOA: special.2009.12.02

They are using radars and other equipment to learn more about how, why and where tornadoes form.

VOA: special.2009.06.09

Today we tell you about some new understanding of why cutting the main branch of a plant or tree can lead to better development.

VOA: special.2009.10.13

That is why the word heart is used in so many expressions about emotional situations.

VOA: special.2010.07.18

That is why we are here today. I want to be clear about this.

VOA: special.2009.11.13

Why should there be any question about my age?" "Oh,it wasn't a question.

VOA: special.2009.10.11

Why don't you tell me about it?"

VOA: special.2009.07.25