The probability of a response is determined by its reinforcement history.
The key to success is to keep growing in all areas of life - mental, emotional, spiritual, as well as physical.
"The truth is rarely pure and never simple."
海洋的健康反映了人类的健康。
化学是在微观和宏观之间搭建桥梁的艺术。
We are amusing ourselves to death.