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第149章 桂林(1 / 2)

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白木天不知从哪里摸出一支古董铅笔,他把笔芯对朝吴穹说:“选碳12是因为碳12有得天独厚的测量优势。这支铅笔是1874年生产的,到现在已经有两百年的历史,但是里面的笔芯依然非常完好。”

“这房子里还有古董啊!”吴穹看着古董铅笔两眼放光,“院长真的太土豪了!还收藏了1874年生产的铅笔。”

白木天的眉头微微蹙了蹙,“如果院长以前用过这支笔,我是说……哎,算了,还是说正题吧。”

“你是怀疑院长的年龄超过两百岁?”吴穹觉得白木天话中有话,左右想想大概就这一条说得通。

“我不知道。”白木天说,“全球生物学信息共享是从30年前才开始实行的,在此之前院长或许可以通过一些办法伪造身份。我瞎猜的,你别多想。”

吴穹眯起眼睛看着白木天,“白师兄在细胞学院做那么多年保安,细胞学院的秘密你肯定知道不少吧?连这座房子的来历你都能打听到,你是不是还打听到别的什么不可告人的秘密?”

“现在是上课时间。”白木天强行把话题往正道上拉。“刚才说到碳12。在自然条件下,碳12的化学性质非常稳定。比如这支铅笔里的石墨笔芯,再比如深埋在地下几亿年都不腐不化的煤,或者象征忠贞爱情的钻石。

“以上物质都是碳12单体,随随便便存放几亿年也不会发生任何变化。在元素周期表上,与碳同一个周期的其他元素要么化学性质不稳定,要么常温下是气体不好测量。其他周期的元素不是太重就是太轻。

“碳12是元素周期表上的第6号元素,原子核里有六个质子和六个中子。因为相对原子质量是12,所以被叫做碳12,是碳元素的同位素之一。”

白木天又抛出一个问题:“测量摩尔常数为什么是取0.012千克碳12,而不是取1千克这样的整数?”(注1)

这回吴穹已经完全跟上白木天的思路:“因为科学家想测量质子和中子的平均数量。0.012千克除以12是0.001千克,也就是1克。科学家真正想知道的是1克重的质子和中子究竟有多少个。”

白木天把玩着手里的铅笔,嘴角弧度慢慢上挑。“院长说得没错,你本身底子不错。但是你从小接受到的基础教育太弱了,你的老师只给你介绍过事物的表象,没有给你深入介绍过事物的本质。”

吴穹的脑回路或许跟不上杭滨,但是吴穹还没有笨到猜不出事情来龙去脉的程度。“白师兄,你跟我说句实话。你到底是主动辞职的,还是院长专门把你派到这里来的?”

白木天老谋深算一笑,“天机不可泄露。”

“哼!”吴穹脖子一歪,“你们又在盘算什么见的人的事情?”

白木天站起身随意做两个扩胸运动,然后拖起吴穹往外走。“今天学得不错,走跟我出去转两圈去。”

“你要去哪里?”吴穹顿时警觉起来,“你别又想着往酒吧走啊!你这人的酒品全宇宙最差,你要是再喝醉了我可不会伺候你了!”

白木天对醉酒一事没有半分羞赧,反倒是大摇大摆地说:“不喝酒,就是到山外面去看看。”

“啊?要出山啊?”吴穹闻言有些犹豫。整天在山肚子里躲着也不是个办法,但是跑山外面去又会被人看见。

白木天帮吴穹做下决定说:“狗仔队要真想挖出你的下落,你就算是一辈子不出这山也没用。放松点,大不了你写几篇文章抨击回去。”

白木天说得似乎有几分道理,吴穹越是躲躲藏藏,吃瓜群众就越是觉得错在吴穹身上。吴穹要拿出点气魄来,再不济就招一群粉丝和林震粉丝来一场世纪大辩论!

“好吧!”吴穹问,“那我们去哪里呢?”

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