Electric current to the brain 'boosts maths ability'

Cross-references:<p><a href="http://news.ycombinator.com/item?id=1870798" rel="nofollow">http://news.ycombinator.com/item?id=1870798</a><p><a href="http://news.ycombinator.com/item?id=1869772" rel="nofollow">http://news.ycombinator.com/item?id=1869772</a>