In 1954, researchers Peter Milner and James Olds discovered the pleasure center of the brain.

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Lawrence Lee, the former solicitor for Jon Venables, one of two 10-year-olds who murdered two-year-old James Bulger in 1993, said the statistics were "very worrying".

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Her call was echoed by James Alexander, president of NUS Scotland, who argued 18-year-olds were old enough to take responsibility.

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