ADA2h has two helix-shaped structures called alpha helices that are packed against a flat, sheet-like structure.

ECONOMIST: Folding stuff

Engineers from University of Michigan found they could be used to obscure objects so that they appeared to be nothing more than a flat black sheet.

BBC: Carbon nanotubes experiment results

By using the latest in rear-projection technology, a high resolution, colour 3D-like holographic image is projected onto a flat two-dimensional sheet of acrylic in the shape of a woman.

BBC: Airport avatars offer travel advice

They coated the array with a thin film of gold and placed it above a flat, gold-coated sheet of glass.

BBC: 'Cloaking' idea traps a rainbow

The rest of the arsenal is simple: a pizza stone or two to boost and hold that all-important heat in the oven and a peel preferably metal (tip: you can use the flat back of a baking sheet in a pinch) to extract the pie with a minimum of mess when it's ready.

WSJ: Homemade Pizza Recipes: Pizza Perfect

She laid him back down and walked around the bed, working the sheet until it lay reasonably flat.

NEWYORKER: The Visitor

Finally, having started with a clean sheet, Emirates has a flat management structure and the kind of flexible, highly productive workforce that carriers such as strike-torn BA and high-cost Lufthansa can only dream of.

ECONOMIST: Aviation in the Gulf: Rulers of the new silk road | The

Treasury Secretary Tim Geithner's tax troubles--a result, his handlers had said, of tax code complexity--underscore the need to drastically simplify that code with a flat tax, where a return can be filed on a single sheet of paper or even a postcard.

FORBES: Fact and Comment

Treasury Secretary Tim Geithner's tax troubles--a result, his handlers had said, of tax code complexity--underscore the need to drastically simplify that code with a flat tax, where you could file your return on a single sheet of paper or even a postcard.

FORBES: Flat Tax, Anyone?