Finding a special present for his girlfriend's birthday was no problem for one multi-millionaire internet whizzkid who paid R&B star Usher £50,000 (€62,518) to sing his hits and cut the cake at a London nightclub.

Recordings made by instruments sensitive to sound below the threshold of human hearing may help investigators build a timetable of any uncharacteristic movements made by the space shuttle Columbia minutes before it broke apart, scientists say.