Graham Cluley, a computer security expert from net security company Sophos, told the BBC that there were ways for computer owners to protect their machines from this type of fraud - for instance, by using up-to-date anti-virus software.

BBC: Luminous keyboard

Its 112 pages unveil the mysteries of the craft of artisanal fisherman Edilson Miguel da Silva, 61, who, for 35 years, has built and employed this type of raft, which has nowadays been replaced with more up-to-date vessels.

UNESCO: OFFICE IN BRASILIA