Disruptions and revolutions are quick and often violent, but I wonder if structurally what happens in these situations is the spontaneous replacement of an old central structure (the shaft) with a new exoskeleton (the housing of the engine itself) that can contain an energetic process of a higher order than the old structure could metabolize.

FORBES: For Radical Innovation, Nature Loves A Vacuum

The paradoxical romance of heavy industry, the destruction of old parts of town and their replacement with desolate tracts of soul-killing state modernism, and the thrill of teeming crowds at soccer games, on beaches, and aboard ferries are all ingeniously conjured through montage sequences, set to music, that suggest the culmination of the music video.

NEWYORKER: Of Time and the City

The assumption is that if African purchasing power remains relatively constant over the next few years and the cost of imported replacement weapons remains significantly higher than the cost of the old stuff, total numbers will decline over time.

FORBES: Move up http://i.forbesimg.com t Move down

These "Raptors" would permit the replacement of thirty-year-old F-15s with stealthy planes capable of providing assured air superiority and support for ground forces, even against enemies with advanced anti-aircraft defenses.

CENTERFORSECURITYPOLICY: John Kerry's defense budget

Mr Romney has embraced the budget of Paul Ryan, the Republican chairman of the Budget Committee in the House of Representatives, which promises steep cuts in federal entitlements, including food stamps and Medicaid, and the replacement of traditional Medicare for the old with cheaper vouchers.

ECONOMIST: The size of the state

Their mission: to establish the price of a hip replacement for their mythical 62-year-old uninsured grandma.

FORBES: How Much is that Hip Replacement in the Hospital?

Liberal Democrat social justice spokesman Robert Brown said the old system of debt recovery was outdated and that the Bill offered a replacement.

BBC: Debt scheme 'dog's breakfast'