Even the slower-witted among us can improve mental agility with a few daily brain teasers, a study suggests. For those who hate crosswords but still fancy shining at work - fear not. The US-Swiss team behind the research say computer-based tests, which challenge the individual according to ability, may be more effective. Writing in the respected Proceedings of the National Academy of Sciences, they found "significant improvements" in students who took part in their trial. Some 35 volunteers were given daily exercises lasting around 25 minutes, while 35 further participants...
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