The death of Princess Diana in 1997 was even an occasion where the scale and intensity of public grief not only caught UK officials by surprise - but threatened to turn Britons against the Royal Family for their perceived remoteness.

BBC: What is 'national mourning' for?

Both, like Mr Qaddafi, referred to themselves in the third person and belittled the scale and intensity of the opposition.

ECONOMIST: The Arab uprisings

The time required to meet the goal will depend on the level of intensity, categorized on the scale as Low impact, medium impact, or high impact.

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