▽New Scientist - International News, Ideas, Innovation ●05/12 07:42 MathematicsWhat 7 fiendishly hard puzzles tell us about the nature of mathematics25 years ago, a $1 million reward was promised to anyone who could solve one of seven incredibly hard maths riddles. With only one of them now solved, what will it take to crack the rest?FeaturesSubscriber-onlyMindHow to harness your emotions for a happier, calmer lifeFeaturesSubscriber-onlyMindCan we get be