Middle East Professor Avraham Sela says the ceasefire offer shows Hamas is going through the normal evolution of a radical movement.

BBC: Hamas rises from the PA's ashes

This designs enzymes in the way that normal evolution designs organisms.

ECONOMIST: Advanced biofuels

Although some of this pullback can be explained by the recent moderation in the growth of output, the magnitude of the slowdown has been somewhat greater than would be expected given the normal evolution of the business cycle.

NPR: Bernanke: U.S. Growth 'Moderate' as Inflation Rises