Its sprawling network of warehouse-size data centers around the world scrapes and analyzes the Web for every clue to how we search for what's out there.

FORBES: Magazine Article

During the manhunt, authorities released one clue that they said may help in the search.

CNN: Killer captured after being mistakenly freed in Chicago

Yet if you ask Democrats what their central message is to keep control of the U.S. House and U.S. Senate, you're likely to get a lot of head scratching, finger pointing and eyes rolling to the skies, maybe in search of an angel descending from heaven to give them a clue.

CNN: Democrats, show some fight!

Verne's heroes - the eccentric Professor Lidenbrock and his long-suffering nephew, Axel - discover a clue encrypted in an old Icelandic manuscript that sends them to the island in search of a passage to the core of the planet.

BBC: An Icelandic journey to the centre of the earth