诺贝尔奖得主理查德·弗因曼说过:“我们研究物理的人每天都与时间打交道,但千万别问我什么是时间,它难得让人无法思考。”最近,在得克萨斯州奥斯汀一家咖啡店的墙壁上,有一段随意书就的话,似乎回答了这个问题:“时间是大自然使万物免于同时发生的一种手段。”这或许是时间的最好定义。在大部分历史时 Richard Forman, Nobel laureate, said: “We study physical people deal with time every day, but do not ask me what time it is, it is rare for people to think.” “Recently, in Texas A freehand book on the walls of a coffee shop in Austin, Texas, seemed to answer the question: ”Time is a means by which nature prevents all things from happening simultaneously." This may be the best definition of time. In most of history