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

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

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

VOA: standard.other

"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