World's common birds 'declining'

First flight of algae-fuelled jet
Continental Airlines is the latest to to test-fly a jet biofuel, this time with a product derived partially from algae.

Hard drive destruction 'crucial'
The only definitive way to destroy the data on your hard drive is to destroy it completely, a study finds.

Everest trip helps critically ill
Blood oxygen levels recorded on a trip by medics to Everest could help the treatment of critically ill patients.

Black holes 'preceded galaxies'
Astronomers solve a cosmic chicken-and-egg question: what came first - black holes or galaxies?

'Spookfish' has mirrors for eyes
A deep-sea fish caught in the Pacific has eyes which use mirrors instead of lenses, scientists discover.