Like an experiment that takes a few days to show results, clues soon surfaced at the lab, which is run by Dr. Robert G. Roeder, a world-famous molecular biologist whose research focuses on cellular and viral genes, the AIDS virus and other medical mysteries.

About the time the parcels were sent to Professor Epstein and Professor Gelernter, an intriguing new clue surfaced.

The mystery transportation device being developed by the award-winning inventor Dean Kamen - the subject of continuous fevered speculation since provocative clues and predictions surfaced in media reports last January - is not hydrogen-powered, a favored theory in Internet discussions.

No clues as to his whereabouts have surfaced.

The first clue of the North Korea-Iraq deal surfaced in public in October when Dr. Kay released preliminary findings of his inquiry into Mr. Hussein's program for developing unconventional weapons.

I wouldn't be surprised if a few clues surfaced to point to Macho, in one of his uncontrollable rages, as the killer.

But clues about the agents themselves occasionally surfaced.

Much of Easter Island's haunting past remains a mystery, though clues have surfaced about the people, their culture and their fateful decline.

A clue to Mr. Mack's devotion to the Yankees surfaced when he was asked who his favorite player was.

On "Vanished," a Fox kidnapping series, the wife of a Kennedyesque senator is snatched, but as soon as she disappears, clues surface that suggest she is not who she claims to be.