The most visible change is seen in the mountain glaciers, with loss of part of their mass due to decreasing thickness and a substantial recession in the last 100 years.

UNESCO: Dublin Core

Optical correlators, meanwhile, work by encoding images on to a beam of light and, using a special lens, transforming them into their Fourier components building-blocks that encode the thickness and direction of lines in the image, but not their position.

ECONOMIST: Optical recognition

They were wickedly strong too, if the thickness and anatomy of their fossilized bones are any indication.

WSJ: Neanderthals: Why Us and Not Them?

Researchers then used ultrasound devices to measure the thickness of the arteries in their neck and leg.

FORBES: A Backlash Against Vytorin?

The evidence discovered was remarkably detailed: the plotters appeared to have been putting the targeted buildings under close observation, gathering such details as the thickness of the glass in their windows and the numbers of security guards on duty at various times.

ECONOMIST: America and Britain on guard | The