Pilot studies had shown that what might seem an obvious fourth procedure, to tone down, rather than enhance feather colour, was too damaging to work.

ECONOMIST: Male birds cannot afford to relax their standards

"Revolutions" does find, however briefly, a desperately needed change of tone in the heartfelt heroics of Jada Pinkett Smith's Niobe, a courageous pilot who is joined on an ostensibly doomed mission by Laurence Fishburne's stalwart Morpheus.

WSJ: Big Glitch in the Matrix