Francis Crick, co-discoverer of the DNA double helix structure, died in San Diego at 88, having spent his final years unraveling the mysteries of consciousness.

Construction officially begins in Dubai on what will become the Burj Khalifa, the tallest man-made structure ever built.

A three-day hostage crisis at a North Ossetian school ended in chaos and gunfire, leaving over 330 people dead, including 186 children.