人生は、自分で選んだ道を歩むことだ。
The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used.
看待言语的一种方式是，它是一种不断掩饰赤裸的策略。
The truth is: the natural world is changing. And we are totally dependent on that world. It provides our food, water and air. It is the most precious thing we have and we need to defend it.
The causal framework is the foundation of scientific reasoning.