The Internet is a powerful tool for education, but it is not a substitute for the teacher.
一个阅读的孩子将成为一个思考的成年人。
The most profound ideas in mathematics often arise from the simplest observations.
You gotta have fun with it. If you're not having fun, what's the point?
可持续性不是一种选择;它是任何希望在长期内蓬勃发展的企业的必要条件。