Joblessness continues to be a major headache with no significant relief in sight.

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The BBC's Will Ross in Lagos says Okah may no longer be a headache for the Nigerian authorities but the threat of instability in the Niger Delta remains strong, despite a fall in the levels of violence since a 2009 amnesty.

BBC: Nigerial oil militant Henry Okah

These patterns of self-recruitment and self-radicalisation are a headache for security services, who have no easy way to infiltrate close-knit, local groups that operate at first without foreign help.

ECONOMIST: Muslim extremism in Europe

No harm will result other than not seeing well with these glasses or possibly a mild headache if the prescription is far different from yours.

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But there's no denying that a tandem like Revis and Asomugha would have been a game-changer, a colossal headache for opposing quarterbacks.

WSJ: Jason Gay: Philly Out-New Yorks New York