More than 2 million tritium EXIT signs are estimated to be in use in the United States, according the Nuclear Regulatory Commission.
FORBES: Radioactive Tritium Leaks from Nuke Plant; Also Two Million EXIT Signs
It stretched Australian Open champion Djokovic's unbeaten run to 17 games and he will start warm favorite for Saturday's final, particularly after the exit of World No.2 Federer.
In Maryland, exit polls found McCain beating Huckabee by nearly 2-to-1 among suburban voters, who made up about 80 percent of the turnout.
CNN: McCain sweeps Potomac primaries; conservatives still cool
He defeated Clinton by an almost 2-1margin among men, said exit polls.
Prediction 2: Greece will begin official negotiations to exit the euro.
FORBES: Trouble May Be Looming, Get These All-Weather Stocks Now
Former world number one Juan Carlos Ferrero of Spain made an early exit from the competition, beaten 4-6 6-2 6-4 by German Mischa Zverev .
Thirty-three miners have been trapped 2, 300 feet underground since a rockslide cut off their exit route on August 5.
The Premier League's bottom team Queens Park Rangers lost 4-2 at third division MK Dons, following Friday's exit by fellow strugglers Aston Villa at the hands of second tier Millwall.
But their compatriot Flavia Pennetta made a shock early exit as the 19th seed lost 6-3 1-6 6-2 against Russian qualifier Nina Bratchikova.
By 11 a.m. on Dec. 19, 2002, exit poll results showed that the iconoclastic Roh Moo Hyun, 56, a 2-to-1 favorite among youth, was losing the election.
In London, Uruguay lost 2-0 to Senegal, pushing another medal contender toward an early exit.
Eighth seed Victoria Azarenka made an early exit after she retired due to a thigh injury when leading Timea Bacsinszky 6-4 2-3, while Ana Ivanovic swept past Olga Govortsova 6-0 7-5.
Murray had been an overwhelming favorite heading into his quarterfinal tie, but found himself staring at a shock exit when he conceded his first set of the week 6-4 and then went 2-0 down in the second.
The top quarter of the draw has a surprising look following the early exit of top seed Roger Federer, with his conqueror Ernests Gulbis beating Filippo Volandri 6-2 3-6 7-6 (7-4) to set up a clash with Feliciano Lopez, who had a walkover after Ivan Ljubicic pulled out with a back injury.
The Briton finally put the memory of his early exit at the US Open well and truly behind him as he won 6-3 6-2 to claim his second title of the year and sixth at the elite Masters 1000 level.
BBC: Andy Murray beats Roger Federer to win Shanghai Masters
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