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If you ask an economist what’s driven economic growth, it’s been major advances in things that mattered – the mechanization of farming, mass manufacturing, things like that. The problem is, our society is not organized around doing that.

La palabra es el arma más poderosa que tenemos para cambiar el mundo.

The mining industry has a responsibility to leave communities better than we found them.

數(shù)學(xué)中的每一個(gè)問(wèn)題都是學(xué)習(xí)新東西的機(jī)會(huì)。

The art of progress is to preserve order amid change and to preserve change amid order.

我年輕時(shí)領(lǐng)略過(guò)一種高尚的情操，我至今不能忘掉，這是我的煩惱。