Russian maths genius Grigory Perelman, who declined a prestigious international award four years ago, is under new pressure to accept a prize. A US institute wants to give him $1m (£700,000) for solving one of the world’s most complex mathematical problems, the Poincare Conjecture. But it is unclear whether Dr Perelman, a virtual recluse, will pick it up. A children’s charity in St Petersburg, where he lives, has urged him to take the money and give it to charity. Dr Perelman, 43, has cut himself off from the outside world for the past four years, living with his elderly mother in a tiny flat said by neighbours to be infested … Continue reading BBC