Guilt is like a bag of bricks. All you have to do is set it down.
Innovation in science often comes from looking at old problems in new ways.
数学中的合作是必不可少的；没有人能独自解决所有问题。
创新不仅仅是创造新事物；它是为了改变人们的生活。
成功只有在字典里才会出现在工作之前。
愚人是那些不能改变他们想法的人。