Someone copied down the plans wrong - they either added something or skipped a step.

FORBES: How Metaphor Affects Thinking About Science

Then the reader must be sure that Mitrokhin, writing in a great hurry, in great secrecy and in great danger, copied everything down right.

ECONOMIST: The Mitrokhin archive

Large parts of Karl-Theodor zu Guttenberg's 2006 legal dissertations were found by Bayreuth University to have been copied and he stood down before it issued its damning verdict in May 2011.

BBC: German minister Annette Schavan stripped of doctorate

They broke the book down into hundreds of scenes, copied them onto colored index cards, and spread the cards on the floor, with each color representing a different character or time period.

NEWYORKER: Beyond the Matrix

The aircraft is made of fibreglass with a steel frame and has been copied to the exact details of the original, even down to the rivets.

BBC: 'Cornish Spitfire' heads for US

The Recording Industry Association of America has made headlines by tracking down and suing users, demanding compensation for music that was copied and traded.

FORBES: LimeWire, BitTorrent and BearShare...Oh My!

That cuts down on inventory and wasted factory space, and this, too, has been widely copied.

FORBES: Late Bloomer