Scientists think that black holes grow as small ones merge to form heavier objects.

BBC: RELATED BBC SITES

It will allow astronomers to peer back into the universe's Dark Ages, a period roughly 400, 000 to 800m years after the Big Bang, during which things cooled enough to allow the first large-scale objects, such as galaxies and clusters of galaxies, to form.

ECONOMIST: The Square Kilometre Array

Works of graphic and plastic art are objects whose value is tied to their physical form.

ECONOMIST: A ��right�� too far

The company, made up mostly of former Microsoft employees, was launched to form a technology that would identify digital objects.

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"IR cameras cannot 'see' objects or humans behind flames because of the need for a zoom lens that concentrates the rays on the sensor to form the image, " he said.

BBC: fire fighting

"IR cameras cannot 'see' objects or humans behind flames because of the need for a zoom lens that concentrates the rays on the sensor to form the image, " says Pietro Ferraro of the Consiglio Nazionale delle Ricerche (CNR) Istituto Nazionale di Ottica in Italy.

ENGADGET: Infrared holography lets rescuers see people through walls, fire, walls of fire (video)