A wheelchair used by Stephen Hawking has sold at auction for almost £300,000 pounds ($539,000).
Acclaimed physicist pleads for unity and reveals his fear of a "global revolt against experts" that might get in the way of finding the next Einstein.
- by Nick Miller
The physicist's voice, set to a piece of music, was sent from the European Space Agency's Cebreros station in Spain towards the nearest black hole.
- by Costas Pitas