Just two weeks away from the 60th Anniversary of the establishment of his motherland, for which he had such a deep love, indeed, the love impelled him going back to China right after he finished his postdoc research here at Northwestern University, to accept a starting faculty position at Zhejiang University, to persuade his wife rejecting the faculty position she got in the US to go back with him lest the family be split up and their 3-years old child can only see one of the parents, Dr Tu jumped off the top of the building in which he lived, and terminated his promising research career.

Our last encounter was almost half a year ago, one or two month before his departure for China. At that time, I was impressed by his smile that was always on his face and his politeness. And we chatted for a little while, as both of us are alumni from Tsinghua University, the conversation was very easy-going and a little bit nostalgic.

We say requiescat in pace to him, and hope him find peace in Heaven.

回想起在北京呆的几年，掐指算来，午夜时仍在街头游荡的日子并不算多。想来倒是上高中的时候半夜出来通宵上网的次数要多一些。印象最为深刻的莫过于凌晨三时许，漫步街头，沿街店铺全部门窗紧闭，然后月光如洗，倾泻在柏油路面上。或有凉风戏动墙角旮旯的断烂报章，成为寂静环境里唯一的响动。那时或多或少算是体味了一些忙里偷闲，众人皆睡我独醒的闲情。但忽忽地便到了北京。

到北京之后，人地生疏，刚开始的岁月总是过得那样慢慢悠悠的。课业占据了大部分时间。忽而到了圣诞节，有罗K兄提议上网吧庆祝这个老外的传统佳节。响应者推上自行车一起从紫荆园侧列队出师。不过果然是出师未捷，这伙受过高等教育的帅小伙子们漫漫寻网吧而不得。一路在狭窄的自行车道里列队骑行，有一句每一句地自嘲这圣诞夜欲通宵上网而不得的奇遇。现在回想起来，倒是别有一番滋味。不过其间说的话，走的路已经全不记得。

后来折腾了总得有一两个钟头，在回学校的路上，眼瞅校门就在跟前了，居然发现路旁赫然是一家通宵达旦生意红火的网吧。后来的事已没多少印象，记得最清楚的倒是为了锁自行车颇费了一番功夫。三两成群，一定要和别人的车锁在一起才多少觉得安稳。似乎当时我只能把自己的自行车锁在最外面，虽然和张Y还是小罗的车锁在一起，但总还是觉得在外侧显眼招贼，让我颇有些悬心。进了网吧，要看身份证，大家都亮了学生证表示一下。这么一大班子来自于五道口技术学院的帅小伙子们齐集来到这个无名小网吧通宵，实在是让店主高兴了一把，想来真是觉得蓬荜生辉吧。

后来大家玩CS，算是岩色和李ZY比较出色。我多半是早早毙命然后换视角看别人怎么死。记得竟有一次失手把高手岩色给灭了，岩兄无法自已，大呼：“我竟然给PS给灭了！！！”。向来对游戏不是太感冒的我竟然颇有一些高兴，算是发现这个玩意竟是如此有意思。

后来不知怎的出了网吧，发现自行车全都在，真是高兴了一把。大伙乘兴回巢，一大清早见到人总是那么高兴，被别人误会成勤学上进，清早就起来在校园里驰骋的感觉总是不错的。后来如何真是彻底忘了。丁兄似乎是坚持要吃完一碗泡面才肯睡，认为要保持健康的生活习惯。我也忘了自己吃没吃，上铺倒头睡了。