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

Mister Weindruch says researchers do not know why reducing calories increases the length of life.

VOA: special.2009.09.01

They do not know why all these things were found together in one place.

VOA: special.2010.08.03

Scientists do not know why women are more at risk than men.

VOA: special.2009.04.14

Researchers do not know why happiness increases as people get older.

VOA: special.2010.08.03

Scientists do not know why women are more at risk.

VOA: special.2010.06.15

I do not know why I should fear death.

VOA: special.2010.07.10

Doctors do not yet know why this is true.

VOA: special.2010.06.15

"Who are you?" "What do you want?" "Why are you doing this?" James, let's not play with our food.

VOA: standard.other

"We have had a lot of inquiries about that,". "And it does not have anything to do with why we are actually down there.

VOA: standard.2009.10.20

"I do not think a prolonged period of uncertainty is a good thing, that is why I want to arrive at a decision, we want to arrive at decision, as soon as possible."

VOA: standard.2010.05.10

"The reason why I do not think it is likely is because of all the resources we have put on this, considerably more than the last administration did, to see to it that it will not happen."

VOA: standard.2010.02.14

"I saw all these ships waiting out there,I am guessing, waiting their turns to load and unload the cargo, so,I said,Why do the ships come into the harbor?" Why not have the harbor go out there and bring the goods in?'" Researchers describe the mobile harbor as a lean, light system for unloading container ships even if the coastal area is too shallow for them to dock.

VOA: standard.2010.01.04