Behavior is determined by the current stimulus situation and past reinforcement history.

I am fascinated by the complexity of human relationships.

书写一生就是给予它第二次机会。

做伟大工作的唯一途径就是热爱你所做的事。

他在主张杠杆原理时所说。

In science, the credit goes to the man who convinces the world, not to the man to whom the idea first occurs.