Powerset on Sunday unveiled tools for searching Wikipedia that use conversational phrasing instead of keywords, marking the first step of its challenge to established web-search services such as Google. Powerset's technology breaks down the meaning of words and sentences into related concepts, freeing users from always needing to type the exact words they want to find.

NOT QUITE THE MOVIE OF THE WEEK: Shaun de Waal reviews The Other Boleyn Girl, starring Natalie Portman.

British actor Paul Scofield, famed for his Oscar-winning portrayal in A Man For All Seasons, has died aged 86 of leukaemia, his agent said on March 20. Agent Rosalind Chatto said Scofield died peacefully at a hospital near his home in southern England.