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

VOA: special.2009.06.09

They do not know why da Vinci painted it, or how it ended up in the collection of French ruler Francis the First.

VOA: special.2010.06.23

She developed the theory explaining how and why the ozone hole happens over Antarctica.

VOA: special.2009.03.13

I struck boldly." Booth described how and why he had shot the president.

VOA: special.2010.01.07

That is why she is interested in how others face hardship.

VOA: special.2011.05.04

Well,I got them saddles built, and then somebody would say 'Hey,why don't you build me a saddle?'" That was how Nancy Martiny got into the saddle making business twenty years ago.

VOA: special.2011.01.31

' And so,I wrote the song called 'Why Didn't I Think of That?'" "How incredibly stupid not to have thought of that myself.

VOA: standard.2009.11.25

What and how the Japanese eat, he says,explains why they are the healthiest people on earth.

VOA: standard.2010.02.23

"People can look at things and be curious about them, but if you are an explorer you want to know why and how and maybe develop an experiment to test the hypothesis."

VOA: standard.2010.06.21

It is why they are wondering what kind of political solution wants to propose and I think the debate will be how we can get out of Afghanistan without any kind of defeat."

VOA: standard.2009.03.29

"Everybody used that picture as a motivational tool of why we're truly here, because regardless of what's going on and how devastating it is, there are still people that recognize and believe that the Comfort is here to help them."

VOA: standard.2010.03.26

"We are,as you may expect, encouraged by these results and look forward to undertaking further research to understand what it means, why the vaccine regimen was effective in some volunteers and how we might build upon these results in our collective research,".

VOA: standard.2009.10.20