How do pencils write on paper?
5/21/202647 min
Why does a pencil work so perfectly? Why does graphite leave marks on paper instead of just crumbling apart? And what do pancakes, honeycombs, geckos, and intermolecular forces have to do with any of it? This week we follow a simple pencil all the way down to carbon atoms, graphene sheets, and the weirdly satisfying chemistry that makes writing possible. Plus: final exam horror stories, missed alarms, and why reading the syllabus might save your GPA.
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Timestamps
0:00 – The strangely satisfying feeling of fresh pencils 1:03 – So… how do pencils actually work? 2:07 – A “polymer eraser” sparks this whole episode 3:10 – Are pencils disappearing for Gen Alpha? 4:35 – Graphite, graphene, and carbon structures 6:20 – What graphene actually looks like 7:10 – Carbon bonding and tetrahedral shapes 8:10 – Double bonds and flat molecular structures 9:40 – Electron highways and conductivity 10:20 – Melissa’s graphene model demonstration 13:10 – Why graphene could replace silicon chips 13:30 – Carbon nanotubes explained 14:40 – What holds graphite layers together? 15:00 – Intermolecular forces return 17:10 – Quick refresher on intermolecular forces 18:50 – London dispersion forces and temporary dipoles 19:30 – Why graphite is brittle 20:00 – How pencils leave marks on paper 21:20 – Why graphite is basically perfectly designed for writing 22:00 – A detour into paper, parchment, and writing history 24:00 – Pencil hardness and clay mixtures 26:30 – Jam attempts a chemistry-heavy recap 33:20 – Cliffhanger: how erasers work 34:00 – Final exam disaster stories 36:50 – Oversleeping a college final 39:10 – Melissa’s sprint across campus in pajamas 41:00 – Read the syllabus. Seriously. 43:10 – Teasing next episode: erasers and other forms of carbon
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Clips
Transcript preview
First 90 secondsMelissa Collini· Host0:00
Jim, have you ever opened a nice fresh notebook or, for me it's a crossword puzzle, and get your pencil out, and it's just like the most magical feeling of a fresh start?
Jam Robinson· Host0:12
Um, I guess yes, but I ha- I don't use notebooks very often now, or crosswords.
Melissa Collini· Host0:21
Or pencils.
Jam Robinson· Host0:22
Or pencils, but like, but I'm thinking that there's some sensory memories coming to my mind.
Melissa Collini· Host0:28
Yeah. You know the feeling though, right?
Jam Robinson· Host0:30
Yes.
Melissa Collini· Host0:31
Like, what does writing with a pencil bring to mind for you?
Jam Robinson· Host0:34
Hmm. Um, I was very particular about the type of pencils I would draw with back when I was really into drawing and art and stuff like that, and so I just have a memory of like the kind of pencil I liked, the paper, the f- the feeling of the texture on it, you know?
Melissa Collini· Host0:50
Right, yeah.
Jam Robinson· Host0:51
Um, yeah, all that stuff. The smell of a, of the paper, smell of freshly sharpened pencil, you know?
Melissa Collini· Host0:59
Ooh, I love the smell of a freshly sharpened- Mm-hmm ... pencil, yeah.
Jam Robinson· Host1:01
Good stuff.
Melissa Collini· Host1:02
All right. Well, today, we're gonna talk about how pencils even write on paper.
Jam Robinson· Host1:08
Oh.
Melissa Collini· Host1:09
Are you ready for it?
Jam Robinson· Host1:10
I'm ready. Let's do it.
Melissa Collini· Host1:11
Yay. [instrumental music] Hey, I'm Melissa.
Jam Robinson· Host1:23
I'm Jim.
Melissa Collini· Host1:24
And I'm a chemist.
Jam Robinson· Host1:25
And I'm not.
Melissa Collini· Host1:25
And welcome to Chemistry For Your Life.
Jam Robinson· Host1:27
The podcast helps you understand the chemistry of your