—— 请按键盘 空白键 开始游戏 ——

In mathematics, the journey from confusion to clarity is the most rewarding experience.
The most significant threat to liberal democracy today is not from rival ideologies like communism or fascism, but from within—from the rise of populism and the erosion of democratic norms.
I’m not afraid to be different, I’m afraid to be the same.
The study of cognition is the study of how human beings understand their world.