In Theodore Maiman's first laser, a rod of man-made ruby supplied the electrons.

VOA: special.2010.09.01

This is a famous picture of Lee Harvey Oswald who was being assassinated by Jack Ruby.

这是李·哈维·奥斯瓦尔德的著名照片,他被杰克谋杀。

耶鲁公开课 - 心理学导论课程节选