著名天体物理学家、1983年诺贝尔物理学奖得主钱德·拉塞卡喜欢给学生讲这样一个故事:从前,有五位王子,师从一位名师学习射箭,其中一位王子被认为是所有王子中射箭技术最高超的。一次,一位吟游诗人来看王子们训练,在他看来,他们全都表现得非常好,分不出高低。他带着自己的观测结果去见老师,并问他为什么认定其中一位箭术是最高超的。老师领着吟游诗人来到五位王子面前,要求他们瞄准落在一棵树上的一只鸟的眼睛,然后问他们看见了什么?第一位王子说,他看到了鸟的眼睛、树枝、花和远处的天空。轮到那位被认为是最佳射手的王子时,他说:“除了鸟的眼睛以 Well-known astrophysicist, 1983 Nobel Prize winner Chandrasekar likes to tell students such a story: In the past, there are five princes, teachers learn archery from a famous teacher, one of the prince is considered to be Archery in all the highest super-technology. Once, a minstrel came to see princes training, in his opinion, they all performed very well, can not tell the level. He went to see the teacher with his observations and asked him why he identified one of the most archetypal. The teacher led the bard to the five princes, asking them to aim at the eyes of a bird falling on a tree and asking them what they saw. The first prince said he saw the bird’s eyes, the branches Flowers and sky in the distance. When it came to the man who was considered the best shooter, he said: ”Except for the bird’s eyes