He never saw them again. The disappearance of Mallory and Irvine on Mount Everest remains among the greatest exploration mysteries of the last century.

VOA: special.2010.06.30

That is when she became interested in the mysteries of the sea.

VOA: special.2010.03.14

The winner was observations about mysteries of the universe.

VOA: special.2009.06.24

Darwin said the Galapagos brought people near "to that great fact that mystery of mysteries the first appearance of new beings on earth."

VOA: special.2009.12.16

That is one of the greatest mysteries that scientists are attempting to answer.

VOA: special.2010.05.25

Writer-director Christopher Nolan launched his career with Memento and Insomnia, mysteries that delve into how reality can be in the mind of the beholder.

VOA: standard.2010.07.16