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夏日的阳光透过老旧的窗户洒进阁楼，在漂浮的灰尘中画出金色的光柱。空气中弥漫着旧木头和外婆年轻时用过的樟脑丸混合的气味，还有一种说不清道不明的、仿佛来自很久很久以前的时光的味道。
小科今年八岁，是个对什么都好奇的男孩。他的头发有点卷，像春天刚刚冒出的嫩芽，眼睛里总是闪烁着问号的光芒——那是他脑袋里装满问题的最好证明。这个暑假，他来到乡下的外婆家度假。外婆家是一栋有着上百年历史的老宅子，青砖黛瓦，木质楼梯踩上去会发出"吱呀吱呀"的歌声。
"小科——，下来吃西瓜啦！"外婆的声音从楼下传来，带着慈爱的笑意。
"就来——"小科应了一声，却没有马上动身。他的目光被阁楼角落里的一个大木箱子吸引住了。那个箱子被灰尘和蜘蛛网覆盖着，看起来已经很久没有人打开过。
好奇心像一只小猫咪，在他心里轻轻挠着。
小科踮起脚尖，像小猫一样轻手轻脚地走近那个神秘的木箱。木箱的锁头已经锈迹斑斑，箱子盖上刻着一些奇怪的图案——有圆圈，有方块，还有一些像小花一样的形状。外婆曾经告诉过他，这些图案是很久很久以前的人用来记录重要事情的方式。
The summer sun filtered through the old windows into the attic, painting golden columns of light among the floating dust particles. The air was filled with the scent of old wood mixed with the camphor balls that grandmother had used in her youth, plus an indescribable aroma that seemed to come from long, long ago.
Xiao Ke was eight years old, a boy who was curious about everything. His hair was slightly curly, like the tender sprouts of spring, and his eyes always sparkled with question marks—the best proof that his head was full of questions. This summer vacation, he came to his grandmother's house in the countryside. Grandmother's house was an old residence over a hundred years old, with blue bricks and dark tiles, and the wooden stairs sang "creak, creak" when stepped on.
"Xiao Ke—come down and eat some watermelon!" Grandmother's voice called from downstairs, carrying a kind smile.
"Coming—" Xiao Ke responded, but didn't move immediately. His gaze was attracted by a large wooden box in the corner of the attic. The box was covered with dust and cobwebs, looking like it hadn't been opened for a very long time.
Curiosity was like a little kitten, scratching gently in his heart.
Xiao Ke stood on tiptoe, approaching that mysterious wooden box as silently as a cat. The lock on the wooden box was covered with rust, and the box lid was carved with some strange patterns—circles, squares, and some shapes like little flowers. Grandmother had told him that these patterns were how people long, long ago recorded important things.
"说不定里面藏着宝藏呢！"小科自言自语道，心跳不由得加快了几分。
他找来一把生锈的铁钥匙——这钥匙是他在木箱旁边的破罐子里发现的。钥匙插入锁孔的时候，发出了"咔哒"一声，像是什么沉睡已久的东西被唤醒了。
木箱盖缓缓打开，一股更加浓郁的气味扑面而来——是旧书的味道，混合着纸张慢慢老化的温柔气息。
箱子里的东西让小科瞪大了眼睛：几本发黄的旧相册、一叠用红布包着的布票和粮票、几枚锈迹斑斑的铜钱，还有一个——
等等，那是什么？
在所有旧物的最底层，有一个东西正在发光。
不是阳光反射的那种光，而是一种柔和的、温暖的、仿佛从内部散发出来的淡蓝色光芒。那是一本笔记本，不大不小，刚好能捧在手心里。封面是深蓝色的，上面用银色的字写着一些奇怪的符号。
Xiao Ke thought to himself, "Maybe there's treasure inside!" and his heartbeat couldn't help but quicken.
He found a rusty iron key—the key he had discovered in a broken pot next to the wooden box. When the key entered the lock hole, it made a "click" sound, as if something that had been sleeping for a long time had been awakened.
The wooden box lid slowly opened, and a richer scent rushed toward him—the smell of old books mixed with the gentle aroma of paper slowly aging.
What was inside the box made Xiao Ke's eyes widen: several yellowed old photo albums, a stack of cloth and grain tickets wrapped in red cloth, a few copper coins covered with rust spots, and...
Wait, what was that?
At the very bottom of everything, something was glowing.
Not the kind of light from sunlight reflecting off a surface, but a soft, warm, bluish glow that seemed to emanate from within. It was a notebook, neither too big nor too small, just right to hold in your hands. The cover was deep blue, with silver symbols written on it in strange patterns.
小科屏住呼吸，小心翼翼地伸出手去碰触那本发光的笔记本。
就在他的手指刚刚接触到封面的一瞬间——
"叮咚——"
一个清脆悦耳的声音响起，像是风铃在微风中轻轻摇晃。那本笔记本自己缓缓打开了，蓝色的光芒变得更亮了，在光芒中，小科看到了一些奇妙的画面：
无数的微小颗粒在跳舞，它们有的像小球，有的像链条，有的像积木，还有的像……不，小科揉了揉眼睛，他一定是看错了，那些东西怎么会在跳舞呢？
就在他困惑的时候，一个声音响了起来：
"欢迎来到未来科学探险手册！材料编号：001，启动成功！"
小科吓得差点跳起来，四处张望，可是阁楼里除了他一个人也没有。
"不用找了，我在这里呢！"
那个声音再次响起，这次小科终于看清了——
Holding his breath, Xiao Ke carefully reached out to touch that glowing notebook.
The moment his fingers just touched the cover—
"Ding-dong—"
A clear and pleasant sound rang out, like wind chimes gently swaying in a breeze. The notebook opened slowly by itself, the blue light growing brighter, and within the light, Xiao Ke saw some wonderful scenes:
Countless tiny particles were dancing—some looked like small balls, some like chains, some like building blocks, and some like... no, Xiao Ke rubbed his eyes, he must have been seeing things, how could those things be dancing?
Just as he was puzzled, a voice sounded:
"Welcome to the Future Science Adventure Manual! Material Number: 001, activation successful!"
Xiao Ke was so startled he almost jumped, looking around, but there was no one else in the attic.
"No need to look around, I'm right here!"
That voice sounded again, and this time Xiao Ke finally saw—
一个透明的小家伙从笔记本里飘了出来！
不，不对，他不能完全说是"透明"的。他的身体是由无数个闪闪发光的小球组成的，那些小球排列成一个人形，手舞足蹈的，像是一群萤火虫手拉手组成的舞蹈队。每隔一会儿，这些小球就会变换颜色——从碳黑到深灰，从浅灰到银白，再从银白到透明，简直像变魔术一样。
"我叫碳碳！"小家伙蹦蹦跳跳地说，"我是由碳原子组成的！你可以叫我碳碳，也可以叫我Carbon——不过我更喜欢碳碳这个名字，因为听起来更亲切！"
Xiao Ke揉了揉眼睛，确认自己没有在做梦。外婆讲的故事里的精灵，竟然真的出现了？
"你……你是从哪里来的？"小科结结巴巴地问。
A transparent little fellow floated out from the notebook!
No, wait, he couldn't exactly be called "transparent." His body was composed of countless sparkling little balls, arranged in a human shape, dancing and gesticulating, like a dance team formed by fireflies holding hands. Every so often, these little balls would change colors—from carbon black to dark gray, from light gray to silver white, and from silver white to transparent, simply like performing magic!
"My name is Carbon!" the little fellow said, jumping up and down. "I'm made of carbon atoms! You can call me Carbon, or Carbon-Carbon—I like the name Carbon-Carbon better though, because it sounds more friendly!"
Xiao Ke rubbed his eyes, making sure he wasn't dreaming. The fairy from grandmother's stories had actually appeared?
"Where... where did you come from?" Xiao Ke asked stammering.
"我从很远很远的地方来，远到你要坐一艘比光还快的飞船才能到达！"碳碳一边说，一边围着小科转圈，那些组成他身体的小球在阳光下闪闪发光，"简单来说呢，我来自未来——大概几百年后的未来。"
"未来？"小科的眼睛瞪得更大了，"你是说……未来的人？"
"差不多吧！"碳碳拍了拍手，"不过准确地说，我是一个向导，我的任务是带你认识一种神奇的东西——那就是材料科学！"
"材料……科学？"小科歪着脑袋，"这是什么？能吃吗？"
碳碳听了这话，笑得前仰后合，整个身体都在颤抖，像是一串抖动的糖葫芦。"哈哈，小科，你这个问题太可爱了！材料科学可不能吃，但是它比世界上任何美食都要神奇一百倍、一千倍、一万倍！"
Carbon spun around Xiao Ke, his body sparkling like fireflies. "I came from very, very far away—so far you'd need to take a spaceship faster than light to get there!" Carbon patted his hands. "Simply put, I came from the future—from about a few hundred years in the future."
"Future?" Xiao Ke's eyes grew even wider. "You mean... people from the future?"
"More or less!" Carbon clapped his hands. "But to be precise, I'm a guide, and my mission is to introduce you to something magical—that's materials science!"
"Materials... science?" Xiao Ke tilted his head. "What's this? Is it edible?"
Hearing this, Carbon laughed so hard he trembled all over, his body shaking like a string of candied hawthorns. "Haha, Xiao Ke, that's such a cute question! Materials science isn't edible, but it's a hundred, a thousand, ten thousand times more magical than any food in the world!"
小科的好奇心被彻底点燃了。他一屁股坐在布满灰尘的地板上，地板"嘎吱"一声表示抗议，但小科一点都不在乎。
"那你快告诉我！"他催促道，"材料科学是什么？为什么你说它比任何美食都神奇？"
碳碳清了清嗓子——虽然从他的透明身体里似乎并没有嗓子可清——然后认真地解释起来：
"你知道吗，小科，我们身边的一切——你坐的椅子、你穿的衣服、你吃的西瓜、你呼吸的空气、你脚下的地板、你头上的天空——都是由一种又一种材料组成的。"
"材料就是构成东西的'积木'？"小科试着理解。
"没错！你真聪明！"碳碳竖起大拇指——虽然他并没有真正的大拇指，但那动作做得很标准，"世界上的每一样东西，都是由无数微小的积木组成的。这些积木小到眼睛看不见，我们把它们叫做原子。"
Carbon's explanation completely ignited Xiao Ke's curiosity. He plopped down on the dusty floor, which "creaked" in protest, but Xiao Ke didn't care at all.
"Then tell me quickly!" he urged. "What is materials science? Why did you say it's more magical than any food?"
Carbon cleared his throat—even though his transparent body didn't seem to have a throat to clear—and then explained seriously:
"Did you know, Xiao Ke, everything around us—the chair you sit on, the clothes you wear, the watermelon you eat, the air you breathe, the floor beneath your feet, the sky above your head—is all made up of one material after another."
"Materials are like 'building blocks' that make things?" Xiao Ke tried to unde