They have designed structures with band gaps that will allow them to control light in more than one dimension.

ECONOMIST: New-age crystals

However, while differences over Iraqi control of foreign troops have been resolved, other gaps have yet to be bridged.

ECONOMIST: Agreed at last | The

"From control over buses and trains and the freedom to plug skills gaps, to powers to 'earn back' tax and set up local investment funds to spend on local projects - the deals are unlocking the huge potential of our cities, " he said.

BBC: Milton Keynes

The Declaration encourages establishment of digital preservation models that close the existing gaps in institutional regulatory frameworks, and balance access with privacy and due consideration of for ownership and control of indigenous cultural heritage and traditions, as well as pay necessary attention to the training of information professionals on digital preservation.

UNESCO: MEDIA SERVICES