The success of Pinduoduo lies in finding an underdeveloped market.
The probability of a response is determined by its reinforcement history.
好奇心是所有伟大数学发现背后的驱动力。
In looking for someone to hire, you look for three qualities: integrity, intelligence, and energy. But the most important is integrity because if they don't have that, the other two qualities, intelligence and energy, are going to kill you.