Scientists say extensive observations from earth-based telescopes are needed to confirm the existence of the planets.

VOA: special.2011.02.09

The test uses saliva instead of blood to confirm the infection.

VOA: special.2009.12.22

The amount of money paid to hijackers is harder to confirm.

VOA: special.2009.04.25

Spain says it can not confirm the validity of the claim, but is investigating the report.

VOA: standard.2009.12.09

It will take a few months of road testing to confirm Leonhardt's cost estimates.

VOA: standard.2010.02.23

That means they take a drop of blood and they look at it under a microscope, and they can confirm that this was an actual case of malaria.

VOA: standard.2010.06.17

But the recent U.S.comments confirm what Pakistani officials said weeks ago, that they believe Mehsud died during Taliban infighting following the death of former group leader Baitullah Mehsud.

VOA: standard.2009.10.03

Hamas would not confirm the Israeli reports of progress.

VOA: standard.2009.03.15

"I can confirm we have now well over 20 countries that are indicating or have already indicated they intend to increase the amounts of forces they have in the country - in Afghanistan.

VOA: standard.2009.12.03