In twelfth grade, he built an electronic metronome—one of those tick-tick-tick devices that keep time in music class—and realized it sounded like a bomb.

高中四年级的时候，他做了一个电子节拍器——音乐教室里用来打拍子的、会发出“滴答”声的装置。然后他意识到“滴答”声听上去很像是炸弹定时器的声音。