Although these questions are still to be answered, new research and techniques are beginning to provide intriguing clues.

There was an intriguing clue on a side road here.

An intriguing clue to the origin of psychotic thinking comes from recent brain imaging studies.

But he has noticed one intriguing clue.

Already, Dr. Calne believes he may have one intriguing clue.

There is nothing startlingly fresh about the first two, but her idea of prophecy offers an intriguing clue to what makes her work distinctive.

The copper is the most intriguing clue about the ship.

That discovery led to more intriguing clues.

But the team did find an intriguing clue.

Developmental psychologists say the Vanderbilt research offers an intriguing clue to a phenomenon called the "video deficit."