What you actually pay for something is at least twice the listed price because of the energy， time， money needed to set it up， learn， maintain， repair， and dispose of at the end. Not all prices appear on labels. Actual costs are 2x listed prices.
The journey of science is not just about finding answers, but about asking the right questions.
对习俗和法律的遵从很容易成为对谎言的掩饰，这种掩饰极为巧妙，令人无法察觉。它可以使我们逃避所有的批评，它甚至能够使我们欺骗自己，令我们相信自己是 显然正当的。但是无论他的正当性得到多少公众舆论或道德准则的支持，在内心深处、在普通人的意识层次之下，他仍听到一个低低的声音：“哪儿有点不正常”。
If we don’t do something now, the world our children inherit will be much poorer than the one we were given.
Mathematics advances not by the efforts of individuals alone but through the collective work of generations.