And sometimes landing operations will be too urgent to delay.

FORBES: Gates Challenges Marine Corps' Mission

She uses the wealth of new evidence to examine her subject's extraordinary range of interests, a mercurial side that sometimes verged on unpleasantness, and his ever urgent desire to earn money.

ECONOMIST: A man who, by turns, was seductive and infuriating

Rescue services sometimes need phone data to locate someone who needs urgent help.

ECONOMIST: Data privacy: Out of shape | The

What made intervention in Sierra Leone so urgent was the sheer savagery of the war there, and the sense of common humanity that can sometimes prompt other countries to act.

ECONOMIST: Intervention that worked | The