This is because most cosmologists reckon that the Big Bang could not have generated nearly enough ordinary matter--dark or light--to create a closed universe.

ECONOMIST: The dark side of cosmology

Gamma-rays are the most energetic form of light, with wavelengths far shorter than ordinary optical light (the light your eye can see), or even ultraviolet or X-ray light.

CNN: Why gamma-ray burst shocked scientists

It takes about an hour to collect and aggregate the data ( view a demonstration of a light pulse as it travels through an ordinary Coca-Cola bottle).

CNN: A camera that can see around corners

She sauntered away and left me facing a spare man of ordinary height, whose reddish-fair hair was cut very short and glistened in the artificial light from the hallway.

NEWYORKER: Amundsen

It transforms only around 0.1% of the infra-red light thrown at it into electricity (compared with 20% for an ordinary solar cell).

ECONOMIST: Monitor

In the ad promoting the clean-diesel version of the Audi A3, ordinary citizens are high-handedly arrested for using plastic instead of paper, for possessing old-fashioned incandescent light bulbs and even for not recycling orange rinds.

FORBES: Memo To McCann, Mahoney: Come Up With Better Volt Ads

But as competition from other financial centers intensified, London let its standards slip, relying on its fabled light-touch regulation and the lure of deep pools of passive money to attract businesses that ordinary British savers should never have been exposed to.

WSJ: London Needs Full Inquest