No matter how complex or refined, all behavior is to be explained in terms of stimulus and response.
无论多么复杂或精细，所有行为都可以用刺激和反应来解释。
"The human heart, at whatever age, opens only to the heart that opens in return."
The most dangerous poison is the feeling of achievement. The antidote is to think every evening what can be done better tomorrow.
We are all now connected by the Internet, like neurons in a giant brain.