Cutting a Klein Bottle in Half - Numberphile

Klein Bottle enthusiast Cliff Stoll uses a diamond saw on a glass Klein Bottle.
More links & stuff in full description below ↓↓↓
More videos about his bottles: bit.ly/KleinBot...
Cliff's site (selling bottles): bit.ly/ACME_Klein
Support us on Patreon: / numberphile
NUMBERPHILE
Website: www.numberphile...
Numberphile on Facebook: / numberphile
Numberphile tweets: / numberphile
Subscribe: bit.ly/Numberph...
Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): bit.ly/MSRINumb...
Videos by Brady Haran
Brady's videos subreddit: / bradyharan
Brady's latest videos across all channels: www.bradyharanb...
Sign up for (occasional) emails: eepurl.com/YdjL9
Numberphile T-Shirts: teespring.com/...
Other merchandise: store.dftba.co...

[@imveryangryitsnotbutter]

This is your brain on math.

[@nateshrager512]

hahaha

[@PikalaxALT]

Not even once. Odd always.

[@FRAS3RG]

+I'm Very Angry It's Not Butter Maths* ;)

[@imveryangryitsnotbutter]

***** Mathamphetamines?

[@FRAS3RG]

Yes, Exactly.

[@landonluman2910]

I don't know why but this guy makes me oddly happy

[@aldobernaltvbernal8745]

same.

[@ok64234]

Because he shows passion at what he does.

[@Paul-yu4ep]

Exactly, it's just pure joy from maths!

[@JG-nx3jg]

He makes me unhappy. Mostly because I cant relate to his levels of unironic joy and enthusiasm for life. However, I believe it is an act for the purpose of making educational youtube videos more engaging, so every cloud.

[@MikeCampo]

@@JG-nx3jg Maybe you're depressed.

[@anisometropie]

I’m a proud owner of one of this man’s klein bottles. I ordered one in 2012. This is still to this one one of my favorite items in my possession. The order confirmation I received was one of the best I ever received. Just made my day, with pictures of the klein bottle being packaged and carefully wrapped into bubblewrap. I have kept everything, the papers he sent with Acme literature, invoice, and topological propaganda (using his own words) and the little white package with a smiley glass written on it. I love my klein bottle !

[@SquirrelASMR]

Does it came with his DNA all over it?

[@Triantalex]

??

[@distraughtification]

The first thing we need is a diamond saw. Okay! Here's a diamond saw!!! I mean everyone has one of those lying around right? .-.

[@aronenark8184]

+Shenpo You never know what you'll find in the backyard of a dedicated physical mathematician.

[@jeffha3]

Actually a lot of people do. They're not super expensive or anything, they're just blades tipped with bits of diamond scrap, super useful for a lot of things.

[@ActuallyJozu]

Yeah, wet saws with diamond blades aren't really uncommon at all.

[@you_just]

Diamonds are actually really cheap, it's only the 4 Cs that made diamonds you see in a jewelry shop so expensive.

[@sotirismaragos]

😂😂😂😂😂😂😂😂😂😂😂😂😂 LMAO😂😂😂😂😂😂😂😂😂😂😂😂

[@harryrupam01]

This is how teachers should be :) Being excited to teach & making the students to be excited about the subject too :)

[@MrNUKECOW]

Rupam Shyamal most probably are at the start till the enthusiasm is beaten out of them

[@MrJosh6889]

I have a cs professor who gets pretty excited sometimes. It normally requires a creative, unexpected, eloquent solution in code. Nothing like this guy though lol

[@TheV-Man]

I wish he was my math professor :D

[@TheV-Man]

You guys are so lucky

[@bortsampson6301]

Unfortunately even great teachers or fun people like this guy can't make all parts of math (or any subject) interesting. When you're taking a 14 week 4 credit course or whatever, there's probably only gonna be a few classes worth of stuff that can be made as interesting as the math videos people watch for fun on KZbin. There's a whole lot of less interesting background info that's a lot more important to learn if you're actually going to use that level of math in some way

[@ImmaterialDigression]

if this guy was in The Martian he wouldn't have needed saving. build a whole city out of string and rocks and clone himself some babes.

[@0vesty]

+ImmaterialDigression And made a time machine spaceship. He's amazing!

[@Azivegu]

+ImmaterialDigression nah, he would just make a bunch of klein bottles and forget to tend his potatoes

[@t.f.f.e.d.l8514]

Definitely a film I would have gone and seen. Maybe he could break bad and become the villain.

[@Azivegu]

guess his evil name would be Khaos Klein and he would trap his victims in four dimensional klein bottles from which they can never escape

[@ColinCarmody]

+Azivegu Or maybe slice the potatoes into Klein Bottles!

[@iammaxhailme]

I like this look the hat gives him! Like some kind of... hippie druid wizard professor!

[@CarlosRios1]

He sells rare items

[@bramcorvus2198]

A dank mathamagician you say? I agree

[@Littleprinceleon]

@@bramcorvus2198 meta-mathe-magic

[@Triantalex]

??

[@Sainty-0]

Shows what enthusiasm can do for presentation. This guy is a joy to watch.

[@jmartens759]

I really do envy this guy. he's found Somthing that makes him truely happy.

[@RinoaL]

only somebody who has thousand of glass klein bottles under their house would think to cut one in half in real life. :D

[@Triantalex]

false.

[@snaleks]

Young at heart :)

[@jeremylackey6587]

+snaleks He's like a kid who just got to play with his favorite toys for a living his whole life.

[@thorerik]

+snaleks Suggest looking up Cliff Stoll's TED talk, it's amazing, the topic is nothing in particular except math

[@Verlisify]

I hope to become as awesome and excited about something as this guy when i get old

[@SLA-yo4is]

:)

[@aurelia8028]

Ew. It's you 🤢🤮

[@VampireSquirrel]

how long until there's a youtube channel where cliff cuts random things in half?

[@adaharrisonn]

Rachel Evans it's cause it exists already

[@saetainlatin]

its called howtobasic

[@roowco1]

Its called mrgear

[@seeroflight5783]

roowco1 hello fellow whovian

[@roowco1]

Mikaela Forte hi :)

[@ayush6025]

This guy's enthusiasm is on point. Awesome Video numberphile ..

[@gamesux420]

i wonder how he'd freak out if he met klein xD

[@wynterfoxx2517]

Dr.Kuhmilch Great Scott!

[@drvelocci]

Dr.Kuhmilch ya hahahaha

[@TheSkeletalQueen]

Ok, ok, if we learn to time travel, we get him and take him to meet Klein

[@lc7269]

I love this guy's craziness! Its creepy but so amusing!

[@richard_returns_IRL]

He reminds me of Doc Brown

[@michael1234252]

+Richard Returns Great Scott!

[@EmperorZelos]

+Lucky Abat Not creepy, but it is very charming to see someone with such lvoe and passion for mathematics

[@niklashalonen9296]

me too.

[@nisbahmumtaz909]

+Lucky Abat He's not creepy. You're just "normal".

[@zelo_s6707]

Cliff is like Doc from Back to the Future

[@idle_sheep]

This man looks so excited about everything he explains, I love it.

[@EmersonPeters]

2:04 - Pure joy. First sample of pure joy in a grown-up discovered.

[@dezcubing5844]

The subtitles there is just “!!!!”

[@EmersonPeters]

@@dezcubing5844 Hahaha that's great

[@PS-jx7pv]

I wanted to make a joke about klein bottles, but it was too one-sided.

[@LyraLyraPantsOnFyra]

Kaas Kaas yep jokes about Klein bottles are not edgy enough

[@andregross7420]

it wasnt edgy enough

[@benamlicke2116]

Your jokes are very 1-dimensional

[@RYUMIXTAPE]

Its okay, just tell us a joke :)

[@snowingbook]

**Topological cringe intensifies**

[@Stratocoaster08]

Cliff builds these little machines that, to most of us, are so spectacular and ingenious...but he does it just as little steps along the way in his various Klein Bottle endeavors. His TRUE passion...

[@AnasHart]

What a character!! Reminds me of Doc Emmett Brown from BTTF!!

[@timurchirkov]

That was the idea, i suppose...

[@fobusas]

Am i the only one who was almost screaming: don't cut off your fingers on that diamond saw, doc!

[@sharpe227]

dont worry he has the machine that reattaches them somewhere

[@thepoopenator7341]

2:04 makes me so happy!

[@somedaythewave]

"and i'd love to talk about it some other time" why you do this to us klein bottle man

[@OwenPrescott]

There's something about an eccentric guy like Cliff using a band saw that scares me.

[@ogfan4053]

I love how enthusiastic about everything he does.

[@TheHoaxHotel]

There is the theory of the Moebius, a twist in the fabric of space where time becomes a loop. Where time becomes a loop. Where time becomes a loop.

[@pikdame]

+The Hoax Hotel Where time becomes a loop

[@somesquirrel]

+Pik Dame Where time becomes a loop

[@pikdame]

Where time becomes a loop

[@hrmny_]

Where time becomes a loop

[@hunterborman2887]

+Pik Dame Where time becomes a loop

[@sycabara9229]

OMG I knew I recognized his voice. Then I thought he sounds like the guy from "The KGB the computer and me" and I googled it and IT'S HIM!

[@sophiacristina]

This guys lives like i do, crazy lab inside house, and a wilderness outside of the house, i love all the plants!

[@abhijot5505]

This dude's enthusiasm is Amazing

[@KTFG]

I filled a Klein Bottle… Physicists & Ghost Geometrists alike are stunned!

[@coloneldookie7222]

I've had teachers that made learning mathematics fun and exciting, and some that were pretty boring. On my experienced scale of 1-10, Cliff Stoll is at an 11. He makes me want to go back to school to learn more. But not just from any teacher: just him. I only hope I can inspire excitement of mathematics in my students the way Cliff does in these videos.

[@DanDart]

I love how excited he is!

[@averynhiell]

6:18 I love how he already had two halves of a Klein bottle all along and just wanted to show us the fancy diamond saw in his garden. xD

[@likenem]

Dude reminds me of a doctors sues character When you cut a Klein bottle in half You can easily do the math Two Mobious loops No longer in a group It is easily define One continuous line I know the bars don't flow right.

[@obsidian741]

Oh I just love this guy so much. He looks to have pure enthusiasm and curiosity, and always can't wait to share whatever he got.

[@robertyang4365]

My goodness, his enthusiasm is just pouring out of him!

[@MattKitten]

I wish I was half as excited about anything in my life as Cliff Stoll is about klein bottles. You can tell he's passionate about his work.

[@wills6625]

I love it, youre so crazy and excited about maths ;)

[@hansmuller1846]

...About Klein bottles, indeed.

[@1r587]

he's on crystal math

[@trymedorsen3178]

1r5Drooodle you are a genius

[@Littleprinceleon]

@@1r587 silicon crystal from his bottles

[@jayfenn717]

His eccentricity tells me maths is not the only thing he's using those Klein Bottles for.

[@nagygergely11]

crazy scientist stereotype found

[@Goombario37]

this man is a hero

[@BGroothedde]

With his enthusiasm, Cliff could teach anyone anything.

[@tylerpittman2063]

I want what this guy is smoking

[@kmyc89]

+Tyler Pittman Not "what"- "In what"- in a Klein Bottle

[@electromika]

+kmyc89 He smokes klein bottles... With klein bottles.

[@kmyc89]

Sulthan14 *Everyday*

[@Teth47]

+Tyler Pittman He's smoking science.

[@144ky8]

He smokes Math.

[@anthonywallis2058]

It would be so fun to have him as a teacher

[@kinchiey5910]

The enthusiasm! The energy! The passion! This guy is awesome :D

[@alexkolberg9589]

This guy is a gift to humanity

[@mdmobashshir432]

Old guy needs supervision with diamond saw or else he'll make 5 Möbius strips out of his fingers.

[@mendali]

I love this guy. If only everyone had passion projects that made them so excited and happy.

[@woodfur00]

How can _anyone_ dislike this guy?

[@joelights6476]

They probably dislike the constant focus hunting, improper white balance and shakey cam. It takes away from how awesome this guy is.

[@LeCaNiVideos]

This man has truly put his life to something beautiful. The passion, the excitement, the happiness... Everyone should find what they love and put their entire life to it.

[@GrenYT]

Still under the impression this guy is completely insane

[@marlonyo]

+GrenYT all mathematicians and engineers and also architect go crazy 100% of the time at some point if they live long enough

[@marlonyo]

+marlonyo so they go crazy sometimes all the time

[@GrenYT]

Damn. You are making me reconsider my major now man...

[@novathemagus3740]

atleast I'm already insane

[@hellterminator]

+GrenYT Nah, sanity is overrated.

[@RainAngel111]

the way he gets so excited about it is amazing.

[@pablog3560]

This guy makes you feel happy because that wonderful fascination and appreciation for how reality is that he has, that its contagious because it has a natural cause that we all can perceive. This fascination and appreciation makes you HAPPY because makes you love the reality you,re in

[@drumadude28]

I can only hope to one day become as enthusiastic about something so esoteric as this man. A true legend.

[@Rationalific]

That's awesome! And it's fantastic that this man is so excited by these things he knows that it's like a kindergartner playing some game for the first time. It seems that most old people are tired of life. I don't blame them. Life can get you down. But not this guy.

[@cornishphilosopher]

I love how passionate this guy gets! He's just so excited about wierd shapes!

[@walkergibson.]

i love this dude, he's so energetic and excited for math related things(especially Klein Bottles)

[@tk4x431]

Some people call that dude crazy, but his passion for cool shaped bottles just radiates positive energy to him and everyone watching! I bet if you were pissed off, and you watched this guy, I bet you aren't pissed off anymore! What do you say we rename Klein Bottles to Stoll Bottles!

[@Sillimant_]

You just can't help but love this guy

[@saturn9227]

Something about this Jolly old man is so heartwarming

[@wfcyellow]

4:23 Do you expect me to talk?? No, Mr. Klein Bottle, I expect you to break..!

[@MattKitten]

I love how excited he gets about his job. Truly following his passions.

[@27plays]

omg i love this guy.... he is so energetic

[@why3285]

pGpants cocaine is a helluva drug

[@esotericVideos]

His gesture at 2:03 is amazing

[@Nixitur]

He has a thousand Klein bottles under his house. He is... the most interested man in the world. "I don't always wear hats, but when I do, I prefer non-orientable ones." "Stay four-dimensional, my friends." Seriously, Cliff is just so damn enthusiastic, it amuses me every time.

[@theman2160]

This man's enthusiasm is contagious. I legit would have probably LOVED math right from the get-go if he was the one teaching it.

[@AmbiguousDarlingThings]

who gave this man A DIAMOND SAW? :D

[@stephaniedsouza3042]

love this guy's enthusiasm! and the modification he made to the diamond edge cutter is pretty ingenious

[@ViniciusSouza-sr4rb]

Klein bottle vs 1000 degree knife

[@Owiion]

I love how genuinely exited this guy is. I can't help but feel happy too!

[@enigma1122]

This man is clearly a wizard and I am fine with that.

[@Lynn-rv4ty]

I love how happy this guy is about Klein Bottles

[@sakonpure6]

so enthusiastic love it!!!

[@artanaillazentujin3449]

the most adorable thing Ive watched on youtube. These Klein bottle videos are addicting. Im almost enjoying it as much as he is

[@ninjafruitchilled]

Ack, I want to watch him cut a camera in half but I can't click the video link in android, and the link isn't in the description! Anyone help me out with the link?

[@numberphile]

+ninjafruitchilled there is no link - that is just a little extra snippet I popped on the end as a bonus!

[@ninjafruitchilled]

+Numberphile Oh, so sad! Make a video with the rest of it :).

[@דןעוז-כ7ל]

+Numberphile I would like to see another video with him about lenses,btw where can I buy the hat?

[@TheChipmunk2008]

+Numberphile Shame! It could be included in the video on the mathematics of lenses that you're already planning, RIGHT? :D

[@mattinthehat6780]

I'd really like to see that lens video.

[@Max-hl3wp]

2:04 this guy so excited and i love it. I want him to be my teacher.

[@bigbirdbirdbird]

This guy is so cute. he's so passionate about klein bottles and math and all that, it's just adorable and heart warming.

[@djahriman]

If this guy ever gets into a 50/50 divorce settlement things will get HILARIOUS

[@liquidpotato365]

he'd like build a giant diamond saw and cut the house and car in half and whatever other belongings they share

[@Triantalex]

??

[@djahriman]

That was 6 years ago dude@@Triantalex

[@pandanurse]

This guy is always one of the most entertaining on Numberphile. His excitement for math and engineering is very endearing!

[@Coryceps]

This man for president 2016

[@gmandurj40]

I love how excited this guy gets. He'd make a good teacher

[@MrManUnited1231]

I love this guy's videos :D

[@MaGGiFiXxX]

I'm amazed at how excited this guy is about Klein Bottles, I love it.

[@shishido7]

He is the real life Doc!

[@sagem6044]

I love this guy, he's always so excited about his Klein bottles

[@koolguy728]

I love this guy so damn much! After the last video with him, my girlfriend ordered me one of his klein bottles and he wrote a customized thank you message and also included several pictures of himself with the klein bottle in various locations around his house, and then again of himself with the package showing the serial number and a custom doodle he drew on it. He is really a one-of-a-kind guy, I want to read his biography if he has one.

[@walabter1887]

For him, heaven will be made of klein bottles

[@DDvargas123]

His excitement is contagious.

[@loralogue]

this guy is frickin adorable

[@dmitryivanov5892]

I like this guy. You need more of him. *MOAR*

[@scottb2587]

Where have you been hiding this guy?! He's a star!

[@SeanFarbolin]

I love this guy and his enthusiasm so much.

[@ITSTIMETOSTOP]

This guy is insane.

[@Irishkeyblade]

-ly awesome! =D

[@jetison333]

+Chemical Burns =D

[@kasufert]

+IT'S TIME TO STOP Also outsane.

[@LanceOmikron]

The more videos of Cliff that I see, the more I just can't help but love him. He's the very image of the kooky, fun, friendly science professor, and I wish there were more people like him.

[@xRapidFire52x]

Wow his garden is really beautiful

[@foiledits]

im suprised there werent any klein flowers

[@jonnymiskatonic]

I'll have numbephile playing in the background sometimes, and when Cliff comes on I have to stop everything else and switch back over to the videos. I would have so much fun hanging out with this guy, I love how into klein bottles he is.

[@superawesomeboy]

I'm a Klein bottle, and I'm getting a restraining order from this guy

[@qwertyTRiG]

The enthusiasm is infectious.