Wigan were under intense pressure with their Premiership survival at stake, and they were placed under even greater strain with 16 minutes left when McCulloch was sent off for a foul on Michael Tonge that brought him a second yellow card.

BBC: Sheff Utd 1-2 Wigan

For one thing, the phenomenon of resistance to herbicides, antibiotics, pesticides and chemotherapeutic drugs is well-known and a largely unavoidable concomitant of evolutionary pressure, the result of survival of the fittest.

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And yet those vulnerable or nervous Democrats who face the voters two years before Obama does know the history of midterm elections, and their political survival instincts could bring pressure to take a different path from the president.

CNN: King: Confirmation drama and a test for nervous Democrats

Ultimately, political pressure from the grassroots to force both political parties to deal with the survival of the nation may be the only way to get the attention of the press.

CENTERFORSECURITYPOLICY: Freedom Flame 2013

Secondly, will Germany - under relentless pressure - accept it will have to pay more to ensure the euro's survival?

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And the language divide is much less contentious in Wales and Scotland than it is in Canada, where pressure for independence in Quebec is intimately bound up with French-speakers' worry about the survival of their language and culture.

ECONOMIST: Devolution: The choice for Scotland and Wales | The

In this highly competitive and sometimes harsh environment, marine species have had to develop strategies for survival, such as resistance to the toxicity, extreme temperature, hyper-salinity and pressure that characterize the deep seabed.

UNESCO: MEDIA SERVICES