Black holes are believed to be so dense that not even light can escape their gravitational pull once it crosses over its theoretical border, known as the event horizon.
Once Diablo III got over its initial launch issues with Error 37, PC gamers have been generally happy with the gameplay.
And once the war was over, its borders were simply moved west by treaty.
On getting to Manono after a hazardous journey, free of the usual hyperbole that Congo travels inspire, Mr Rawlence discovers the ruin of a town that once triumphed over nature before becoming its prey.
We headed on over to its booth at CES to give them all a once over, and there's quite a few to get through so let's take a deep breath.
Scotland Yard said Wanstead Flats was the "only practicable site" for its plans and promised it would be returned to its original condition once the event was over.
Many analysts there have warned that once Russia has re-stamped its authority over the North Caucasus it will turn its attention to the South Caucasus, attempting to reassert its influence there too.
Some shadow ministers complain that the minifesto was a golden opportunity to show voters that the Conservative Party was at last thinking creatively about many issues other than Europe, but that Mr Hague squandered this opportunity by over-emphasising once again its hostility to the single currency.
For a label that had once been ahead of its time, it was over.
Once again, Merck's legal battle over its withdrawn pain pill, Vioxx, is magnifying a scientific quibble into a major problem for the embattled drug giant.
Alas, the Coca-Cola brand is not what it once was-its value has declined 4% annually over the past four years, and the stock has seen a corresponding 9% decline.
Even the storytelling in the game, which is at once sort of over-the-top in its comic mythology and sparse enough to keep my short attention span, feels as though its been pulled from a graphic novel.
Once a year, its syndicates wind up and start all over again.
Now, if only it could get more people to try the service once, it may just be on its way to taking over the world.
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Alas, the Coca-Cola brand is not what it once was--its value has declined 4% annually over the past four years, and the stock has seen a corresponding 9% decline.
For example, nobody knows where the moon's weak, erratic magnetic field came from: was the moon bombarded by magnetic meteors, or did it once have its own strong internal magnetic field that has decayed over time?
Despite having won the drivers' championship in 2008, the spy row of 2007, where they had to publicly apologise for having Ferrari data, was very damaging and now there are question marks over the team and its senior members once more.
But once large-cap growth takes over, he says, its outperformance can be huge and last for quite a while.
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Sony, which was once a market leader in various product categories, has seen its fortunes plummet over the past few years.
Burnley keeper Jensen was forced into action once more before an eventful first half reached its conclusion, leaping athletically to turn over Vermaelen's header.
This would also flow over to its origination businesses as companies would look to invest once business confidence resumes and might need funding for these purposes.
Ms Kambites accepts that some of that is true, and explains how a budget supermarket once refused to allow a Fairtrade stall because its customers might be concerned about paying over the odds for inferior coffee.
The Chicago area, for instance, once a hub of candy making, has lost about half its jobs in that industry over the past 15 years.
With the West preoccupied with its own war over Kosovo, and the prospect of keeping the peace once it is over, East Timor may seem a distant and minor concern.
The United Arab Emirates has promised to deposit money in the Central Bank, and Saudi Arabia, which fell out with Jordan during the Gulf war over its forgiving stance towards Iraq, has promised to resume its once-huge handouts.
Once again Samsung had the biggest market share, at 30% worldwide and extending its lead over Apple and Nokia.
Once started, infliximab is generally continued as long-term therapy, although its effectiveness may decrease over time.
The once high-flying stock suddenly crashed and in just over two weeks lost more than half of its value.
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Vietnam also has its version of the over-the-counter market, which specializes in listings of once-state-owned companies that have recently been privatized.
Poland lay 18th on the list - but over a decade numbers increased nine-fold as its workers came to the UK once the country joined the European Union.
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