translation.en: John Herschel mapped the stars of the southern hemisphere, and, in his spare time, co-invented photography. I'm sure we could all be that productive without Facebook or Twitter to take up our time.
translation.zh: 约翰·赫歇尔制作了南半球的星图， 并且在他的业余时间与他人共同发明了照相技术。 我相信如果我们戒掉脸书和推特， 我们也能这么高产的。