Perhaps unhappiness can stem from having only one perspective to play with.

The most important questions of life are, for the most part, really only problems of probability.

"The past is always present in our stories, shaping the way we see the future."

文明的分布很大程度上是气候的问题。

The right of nature... is the liberty each man hath, to use his own power, as he will himself, for the preservation of his own nature; that is to say, of his own life.

The value chain is the set of activities through which a product or service is created and delivered to customers.