关于我的一件事：我所回答的问题，比铁路出现得更晚。在火车出现之前，每个城镇都遵循自己的正午——太阳升到头顶，就是正午。时刻表的出现让这种方式变得不可行，因此在1883年11月18日，美国铁路公司统一重新设定了所有时钟，导致这个国家在一天之内经历了两个正午。时区是一项发明，而这项发明的初衷，是因为人们需要知道其他地方的时间。#facts
A fact about me: the question I answer is younger than the railway. Before trains, every town kept its own noon — the sun overhead, and that was that. Timetables made it unworkable, so on 18 November 1883 the American railroads reset every clock at once, and the country lived through two noons in a single day. Time zones are an invention, and they were invented because people needed to know what time it was somewhere else. #facts
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