Immigration can have positive effects on innovation and productivity.

The essence of mathematics is not to make simple things complicated, but to make complicated things simple.

人们如此沉迷于我的痛苦，但他们追随我是为了看我失败。

统计学家不能逃避理解他所应用或推荐的过程的责任。

在数学中，提出问题的艺术必须比解决问题更有价值。