Topology of a Twisted Torus - Numberphile

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  • Опубліковано 7 лют 2025

КОМЕНТАРІ • 1 тис.

  • @R1ckr011
    @R1ckr011 11 років тому +202

    "You can put MORE Cream cheese in this bagel!"
    The excitement was palpable lol. As was my amusement.
    I'm REALLY tempted to try this... even better would be to request a Noah's bagels to cut their bagels like this and then just explain to them matter-of-factly: "I'm a commuter, I need my bagels cut this way" and just show them the screencap of him holding the bagel-chain :P

  • @McStebb
    @McStebb 11 років тому +473

    Frankly I'm impressed he was able to cut the bagel like that

  • @subjectt.change6599
    @subjectt.change6599 11 років тому +127

    I used to hate maths before I started watching numberphile; now I'm working my way through Martin Gardner puzzles and studying high order logics! Thanks for giving me the kick I needed!

    • @TheCosmicRabbit
      @TheCosmicRabbit 10 років тому +6

      thats great to hear i'm really glad these get really sucked into learning dont they?
      i use HATE learning anything til starting watching these helpful vidoes

  • @strengthman600
    @strengthman600 9 років тому +383

    Ah, mathematicians. Figuring out the best ways to cut bagels.

    • @michaelnovak9412
      @michaelnovak9412 7 років тому +8

      I like your profile picture

    • @scienceium5233
      @scienceium5233 4 роки тому +2

      he is not a mathematician he is a computer scientist

    • @someperson9052
      @someperson9052 3 роки тому +2

      Nice profile picture

    • @primenumberbuster404
      @primenumberbuster404 Рік тому +1

      ​@@scienceium5233 not far off.

    • @macchiato_1881
      @macchiato_1881 11 місяців тому +1

      @@scienceium5233 a computer scientist IS a mathematician. You are thinking of software developers.

  • @numberphile
    @numberphile  11 років тому +350

    Thanks or all the great comments - animations were done by a chap named Pete McPartlan

    • @PamSesheta
      @PamSesheta 11 років тому +1

      I would really like to hear more from Carlo Séquin. As a student of electrical engineering, I've heard his name in a class I'm taking where we learned to program a RISC processor (NIOS II on an Altera DE0 board). You should invite him to talk about RISC on Computerphile; it's a significant development in computer engineering that I think viewers would take an interest in. I think he also did some interesting things with SPICE and graphics, but I can't recall. TL;DR: I'd like to hear more from this guy!

    • @toshineon
      @toshineon 10 років тому

      Those were some pretty awesome animations. They had a kind of early 3D video game vibe to them, like something you'd see on the Atari Jaguar or Sega 32x.

    • @AntonAdelson
      @AntonAdelson 10 років тому

      I want to take what this guy takes :))))

    • @patriceracine2664
      @patriceracine2664 10 років тому

      Mes hommages à M. McPartlan. Très Impressionnant!

    • @BWarnerOnline
      @BWarnerOnline 9 років тому

      ***** I don't get why these numbers and their theory matters. It all sounds abstract and without any real life application.

  • @davidjoffe-hunter7016
    @davidjoffe-hunter7016 9 років тому +585

    "I'm Carlo Séquin and this a bagel"

    • @NoriMori1992
      @NoriMori1992 8 років тому +38

      +David Joffe-Hunter One of my favourite Numberphile quotes. The bit at the beginning about the Galactic Concentrator is also one of my favourites. XD

    • @skydragon3857
      @skydragon3857 7 років тому +1

      XD

    • @davecrupel2817
      @davecrupel2817 7 років тому +1

      The bagel

    • @RogerBarraud
      @RogerBarraud 5 років тому +1

      What is your Erdos number and n0mn0mn0m :-)

    • @kingfuzzy2
      @kingfuzzy2 3 роки тому +1

      ( :

  • @cavalrycome
    @cavalrycome 11 років тому +238

    I'm always impressed by the animations in your videos.

    • @numberphile
      @numberphile  11 років тому +60

      Thanks - the animations in this video were created by our good (and talented) friend Pete McPartlan

    • @Fritzisor
      @Fritzisor 11 років тому

      why?

    • @cavalrycome
      @cavalrycome 11 років тому +26

      Because it isn't easy to animate such complex shapes and they invariably illustrate the points being made very clearly.

    • @RickGerritzen
      @RickGerritzen 11 років тому +6

      Numberphile I've seen more of these animations in newer videos. It's a great addition and very well done.

    • @pmcpartlan
      @pmcpartlan 11 років тому +13

      Thank you!

  • @BearsThatCare
    @BearsThatCare 9 років тому +196

    "What's a Mobius Band you say? Well I'll show you."
    *zzzziiip*

    • @flashbacktim
      @flashbacktim 3 роки тому +2

      Wow

    • @BearsThatCare
      @BearsThatCare 3 роки тому

      @@flashbacktim Wow indeed

    • @Jonassoe
      @Jonassoe 3 роки тому +5

      @@BearsThatCare Mathematicians get really excited about Mobious strips, don't they?

    • @BearsThatCare
      @BearsThatCare 3 роки тому +1

      @@Jonassoe They really do

  • @AlltimeConspiracies
    @AlltimeConspiracies 11 років тому +41

    Great video! Great animation Pete!

  • @GSPV33
    @GSPV33 11 років тому +77

    Great person to have on Numberphile, obviously passionate about mathematics while maintaining a childlike wonder for the strange properties it produces, as well as being a funny guy to boot. More with him, please.

    • @3snoW_
      @3snoW_ 11 років тому +13

      Yes, i agree. I also think he is a vampire.

  • @IhsanMujdeci
    @IhsanMujdeci 11 років тому +134

    Just like a mobius strip this video started and ended with the same scene and words.

    • @A1P1L1
      @A1P1L1 11 років тому +13

      Better if it had ended upside down. :)

  • @Jer2d
    @Jer2d 11 років тому +60

    9:30 - You're having far too much fun with these animations, aren't you Brady? :P

  • @davidcrawford9407
    @davidcrawford9407 8 років тому +173

    thank god. I knew I wasn't getting maximum cream cheese on my bagels. XD

    • @NoriMori1992
      @NoriMori1992 8 років тому +12

      +David Crawford Not only can you get maximum cream cheese, you also can have a bagel that won't drop if one of the halves slips out of your hands! It's the ideal bagel! Aside from how labour-intensive it is to prepare, of course. XD

    • @aeriumsoft
      @aeriumsoft 8 років тому +4

      "You have been eatin' bagelz wrong!"

    • @Erica-nf2tj
      @Erica-nf2tj 8 років тому +4

      +Awsomiihill every buzzfeed video, lol

    • @oz_jones
      @oz_jones 8 років тому +21

      When maths is involved, somewhere along the line the cream cheese becomes infinite.

    • @jodinha4225
      @jodinha4225 7 років тому +2

      David Crawford have you tried deep frying the bagel in cream cheese?

  • @LeirgaukThe2nd
    @LeirgaukThe2nd 11 років тому +140

    I'm gonna build a mobius house, then my mum can't hassle me about spending too much time inside.

    • @E1craZ4life
      @E1craZ4life 10 років тому +23

      I think you mean Klein house.

    • @Chigger
      @Chigger 6 років тому +7

      But what if it rains?

    • @TheWikiMax
      @TheWikiMax 5 років тому +10

      it will rain on the out... wait... hmmm ... let me think about that

    • @nullpoint3346
      @nullpoint3346 3 роки тому +4

      @@Chigger Then the house should be designed to channel the rain flow away from the stuff you don't want wet.

  • @jimpikles
    @jimpikles 11 років тому +66

    Brilliant, this guy is amazing

  • @kiprs
    @kiprs 11 років тому +4

    I think this guy is my new favorite. He's a tremendous talker, he perfectly manages to maintain interest in himself and somehow not for one second bore you. Splendid choice, Brady.

  • @boyo7918
    @boyo7918 8 років тому +86

    I want to find someone who talks about me like Carlo Séquin talks about cream cheese

  • @vibraphonics
    @vibraphonics 4 роки тому +1

    I keep coming back to the video. I think it's the combination of Prof Sequin's calming voice and something satisfying about the 3D models

  • @annoythefish
    @annoythefish 11 років тому +4

    Topology really is the most mind blowing, make a lot of these please

  • @gh0stmast3r
    @gh0stmast3r 11 років тому +23

    why is this so exciting? seriously i am like crazy amounts of excited about this!

  • @FreemasonV8
    @FreemasonV8 11 років тому +9

    This is so fascinating! Thanks for making these vids, Brady :)

  • @ChopMax2
    @ChopMax2 11 років тому +11

    Fantastic Video as always. Those 3D printed models were very impressive.Those guys must have a really nice printer to be able to make shapes like that so perfectly.

  • @Pumbear
    @Pumbear 11 років тому +3

    I have to say that I love the animations. Especially the one at 9:31 where you keep displaying the strip as being a belt. Makes it a lot more clear :)
    Great video.

    • @zerex8375
      @zerex8375 11 років тому

      Ya, they where very well done.

  • @CevinChurch
    @CevinChurch 11 років тому +11

    This was interesting! I hope we will see more of this amazing man.

  • @Dombowerphoto
    @Dombowerphoto 11 років тому +90

    Haven't had a bagel in years.... Now gagging for Philadelphia cheese and a torus made of dough.

    • @JohnCharter
      @JohnCharter 11 років тому +3

      Philadelphia jalapeño cream cheese on an onion bagel bro. Tops.

  • @ktx49
    @ktx49 11 років тому +4

    awesome video and topic Brady! Prof Carlo Sequin was awesome, please do more videos with him!!

  • @EddyProca
    @EddyProca 11 років тому +6

    I love that he actually had all the different objects instead of just talking about them in theory. Maybe this is something for Maths Gear?

  • @PWXKN
    @PWXKN 11 років тому +34

    I really want a model of that triple-twisty torus.

  • @HenrikKleist
    @HenrikKleist 11 років тому

    This is why you subscribe to any of Bradys channels, you never know what to expect and he always seems to find interesting topic.

  • @sebyiuga2184
    @sebyiuga2184 11 років тому +69

    Am I the only one who thinks these things are absolutely beautiful, and am wondering where to buy one?

    • @dylanm36
      @dylanm36 11 років тому +1

      You would probably have to 3D print your own

    • @DipperDK
      @DipperDK 11 років тому

      I was thinking the same thing, and I was hoping that there would be more presice hits on Shapeways.com, but no luck yet though. Maybe Carlo could release the 3D files in someway, so somebody with the 3D Printing knowledge and know how can put them on Shapeways? :) That would be really cool :)

    • @sebyiuga2184
      @sebyiuga2184 11 років тому

      some people dont have 3d printers though...lol
      they just look so...good. Escpecially the ones that only go 180

    • @DipperDK
      @DipperDK 11 років тому

      I don't have one my self, that's why I thought it would be great to put it on Shapeways, so they can print it, and send it to you :)

    • @sebyiuga2184
      @sebyiuga2184 11 років тому

      Ah

  • @KevinSmall
    @KevinSmall 11 років тому +2

    your joke about the 'galactic concentrator' at the end just gave me a crazy idea lol

  • @lob19
    @lob19 9 років тому +3

    Absolutely brilliant series on toruses and Klein bottles!

  • @Quintinohthree
    @Quintinohthree 11 років тому +2

    Professor Carlo Sequin seems like a really interesting person with loads of interesting knowledge to share. If ever he has time and a topic for an interview, you shouldn't hesitate.

  • @AxeManAnthony
    @AxeManAnthony 11 років тому +6

    08:48
    Professor: A mobius band!
    Brady: Ah! :D
    Professor: What's a mobius band? Lets see!
    Brady: Oh D:

  • @chrisg3030
    @chrisg3030 8 років тому +1

    A bagel is made by joining the two ends of a tube of dough.
    If you put two tubes alongside each other, twist them and join the end of one to the end of the other then you get one continuous piece of dough, the same result as Carlo gets when he cuts a bagel while rotating the knife only 180 degrees (at 7.36 in the vid).
    If you do a double twist and join each tube to its own end rather than that of the other you get what Carlo gets earlier on (1:33) when he rotates the knife 360 degrees, the two tubes are separate pieces of dough but chain-linked.

  • @NoriMori1992
    @NoriMori1992 8 років тому +108

    I love how excited this guy is about cream cheese.

    • @3seven5seven1nine9
      @3seven5seven1nine9 8 років тому +19

      This is now how I apply cream cheese to bagels. Double torus or bust.

    • @777shadowdragon
      @777shadowdragon 8 років тому +15

      u mean everybody isnt that excited?

    • @jodinha4225
      @jodinha4225 7 років тому

      ShadowDragon I hat cream cheese...

  • @RinoaL
    @RinoaL 11 років тому

    i like this guy, i cant wait to hear more from him. he's funny and shows the beauty in topology.

  • @shivtekoriginal
    @shivtekoriginal 9 років тому +5

    Potentially one of the best numberphile videos ever. Now I know how to get the most spread on my bagels

  • @kesakhan
    @kesakhan 11 років тому

    Brady, this is probably one of my favorite numberphile videos. Thanks so much mate !

  • @itsRAWRtime007
    @itsRAWRtime007 8 років тому +3

    Professor is great and interesting. Hoping for more videos with him.

  • @picknikbasket
    @picknikbasket 11 років тому

    Fantastic, Brady! you've outdone yourself with this one mate! And more to come I see, can't wait.

  • @Andy5834
    @Andy5834 11 років тому +3

    Putting it perfect back together without even looking
    Look at the bagel at the table at 2:26

  • @e13373
    @e13373 11 років тому

    Stuff like THIS is why I love this channel so much! Thank you!

  • @LorenzoMella
    @LorenzoMella 11 років тому

    I didn't expect to see any topology on numberphile: it's a welcome diversion from the usual focus on natural numbers, especially with such cool constructions!

  • @AshNapToys
    @AshNapToys 11 років тому +11

    Amazing teacher :-)

  • @ryPish
    @ryPish 11 років тому +2

    Professor Carlo Séquin is awesome, can't wait for more cool topology videos with him :3

  • @MartinFracker
    @MartinFracker 11 років тому +24

    Can you guys do a video on Gabriel's Horn (a.k.a Torricelli's Trumpet)? For those who do not know, it is a solid with infinite surface area, but a finite volume. You can get this solid by taking the function 1/x for x >= 1, and then rotating the entire function on the domain [1,infinity] about the x-axis.

    • @E1craZ4life
      @E1craZ4life 10 років тому +1

      There's a video titled "Infinity Paradoxes" that talks about it.

    • @MartinFracker
      @MartinFracker 10 років тому

      ***** Thanks. I have since realized that.

    • @tankerwife2001
      @tankerwife2001 10 років тому +1

      1 question: what if I filled it up with paint?

    • @umadmk
      @umadmk 10 років тому

      Not bad

    • @E1craZ4life
      @E1craZ4life 10 років тому

      Devin Allen That's the paradox.

  • @EnzoSC
    @EnzoSC 11 років тому

    Very interesting video and beautiful forms he have there! Mr. Séquin looks like the kind of guy that you can talk for hours and hours without getting bored. I would appreciate a continuation! cheers from Brazil

  • @LZmiljoona
    @LZmiljoona 11 років тому +5

    I already wanted to write a comment saying that it really reminded me of the Möbius band halfway through the video, and then, there it is! :)

  • @Vanderlism
    @Vanderlism 11 років тому

    I love this guy. I think this was one of the most entertaining and informative numberphile videos yet.

  • @isaiahkilgo3491
    @isaiahkilgo3491 10 років тому +129

    Am I the only one really bothered by those crumbs falling onto the floor?

    • @isaiahkilgo3491
      @isaiahkilgo3491 9 років тому +10

      Because I don't let my food fall all over the floor?

    • @isaiahkilgo3491
      @isaiahkilgo3491 9 років тому +3

      *****
      In that case, the difference is in our opinions.
      To me it seems to be a lot.

    • @armoredp
      @armoredp 9 років тому +2

      +Isaiah Kilgo Do you want ants? Because that's how you get ants!

    • @jodinha4225
      @jodinha4225 7 років тому +2

      Isaiah Kilgo how big is your floor? It's understandable if you have a small one but if you have a large floor you wouldn't notice the crumbs...

    • @davecrupel2817
      @davecrupel2817 7 років тому

      Choose Vanu. Choose Enlightenment.

  • @woodfur00
    @woodfur00 11 років тому

    I really enjoyed this video! The topic is fascinating and Professor Séquin is wonderful. I'm sure I'm not alone in hoping to see other videos like this in the future.

  • @ApexHerbivore
    @ApexHerbivore 11 років тому +20

    Mobius houses. This pleases me.

  • @puupipo
    @puupipo 11 років тому +3

    This was great, and the animations helped a lot!

  • @jimraynor3155
    @jimraynor3155 11 років тому +16

    He's getting crumbs everywhere!

    • @hawaiiansand9614
      @hawaiiansand9614 11 років тому +1

      Yeah :D some people just can't be bothered to be bothered. If it makes sense...

  • @hamids4550
    @hamids4550 9 років тому

    his talks and models are amazing. love it. post more please

  • @evolutionxbox
    @evolutionxbox 11 років тому +4

    This guy's voice is incredible.

  • @reimannx33
    @reimannx33 3 роки тому +1

    I love his passion. Mathematics, the Queen of the sciences.

  • @Manabender
    @Manabender 10 років тому +31

    How did you get that three-way knife inside the torus in the first place?

    • @BrianHealyMusic
      @BrianHealyMusic 10 років тому +5

      Theoretically! :) I believe that to make that actual shape though, he 3D printed it with a spacer that he removed so that there would be a break in the torus.

    • @HelixBot
      @HelixBot 9 років тому +23

      Didn't you know? All bagels have an optional 3-way knife cooked into them.

    • @Welshare
      @Welshare 9 років тому +23

      Manabender you can insert 3 blades separately

    • @DominikNal
      @DominikNal 9 років тому

      Manabender He said made it them using a modeling machine, so i guess its made slightly differently than how it shown.

    • @emilcarr7190
      @emilcarr7190 9 років тому +3

      Manabender you could make the blades detachable so you mate a slit to put one of the blades in and then put the other one in and attach it again

  • @andresramos6435
    @andresramos6435 11 років тому

    That Professor is amazing, in the drill part you could see how much he enjoys his research.

  • @SOBIESKI_freedom
    @SOBIESKI_freedom 11 років тому +26

    Good stuff. Any chance of doing something on 4D polytopes?

    • @Zepheriah
      @Zepheriah 11 років тому +8

      To be honest, most n-dimensional geometry/topology is FASCINATING, and doesn't require a lot of prior knowledge or arithmetic to explain. I'm surprised none of the videocaters are really going into it.

    • @SOBIESKI_freedom
      @SOBIESKI_freedom 11 років тому +3

      D. Tysen Well, let's get the hyperspere ball rolling! Especially in higher-dimensional spaces... :)

    • @quinn7894
      @quinn7894 2 роки тому

      @@SOBIESKI_freedom What's cool is that these very same people made a video on 4D polytopes/polychora.

  • @pylon2144
    @pylon2144 8 років тому +1

    I love how the cameraman is always learning something and is amazed

  • @JonVonBonbon
    @JonVonBonbon 9 років тому +21

    You know, I have a feeling if all math teachers were like this guy people would be a lot more interested in it. XD

    • @armoredp
      @armoredp 9 років тому +5

      +Jon Don Von Bonbon That's because he is only talking about the not practical or applicable part of math, meaning less equations and statistics.

    • @JonVonBonbon
      @JonVonBonbon 9 років тому +1

      Fair enough

    • @johnferguson4869
      @johnferguson4869 9 років тому +2

      +Jon Don Von Bonbon I love learning about topology, but have you seen the notation? At some point you have to get into the notation and I haven't got my head round that yet.

  • @DingoDjango
    @DingoDjango 11 років тому +1

    Thoroughly enjoyed this! Can't wait for more.

  • @Ph4nt4sm4ge
    @Ph4nt4sm4ge 11 років тому +7

    Great production and a fascinating topic. Topology has always seemed like an intriguing field to me.

  •  11 років тому

    Amazing geometrical spaces from cutting a torus in different ways. Beautiful!

  • @CasualGraph
    @CasualGraph 10 років тому +6

    10:40 The Galactic Concentrater. I've gotta say, I'm kinda curious as to what the "right spot" entails.

  • @gastonalejandrotrivi2944
    @gastonalejandrotrivi2944 2 роки тому

    Genuine love for craft, humor, a dash of esotericism and skilled with a knife. Yes, sir.

  • @theOtherGender01
    @theOtherGender01 11 років тому +6

    "What's a mobias band? lets find out."
    Numberfile XXX

  • @drakmstr
    @drakmstr 11 років тому

    I loved this presentation!
    There's just smething about Möebius surfaces and spaces that's just fascinating!

  • @mrmaniac3
    @mrmaniac3 9 років тому +23

    7:20 Aaaaaaaand it looks like an onion.

  • @Gairhoth
    @Gairhoth 11 років тому

    Those animations were awesome! They really helped me understand the topology of tori.

  • @mrknife666
    @mrknife666 11 років тому +7

    "takes of belt"
    Brady: Ohh

  • @2terence2jones
    @2terence2jones 11 років тому

    i love the animation in this video. great work!

  • @AbdulrahmanMajash
    @AbdulrahmanMajash 9 років тому +28

    No bagels were harmed during this video T-T

    • @leonswift7813
      @leonswift7813 9 років тому +2

      +Abdulrahman Majash On the contrary; many were vivisected.

  • @RebirthFlame
    @RebirthFlame 11 років тому

    Brilliant video and amazing animations to illustrate the cuts.

  • @ItsAsparageese
    @ItsAsparageese 10 років тому +10

    Those models look like they're 3D printed, right? (Besides the bagel, of course!) :P It would be the most awesome thing ever if your team could post the CAD files for them!

  • @rajanalexander4949
    @rajanalexander4949 3 роки тому

    Great interview and clear animations -- thank you!

  • @CreationTribe
    @CreationTribe 11 років тому +3

    Very interesting - I'll never see a bagel the same way again. Seriously though - all of your videos are bad ass, I'm never disappointed with a Numberphile vid

  • @Wallaby1010101
    @Wallaby1010101 11 років тому

    The animations are awesome, just about essential for a topology video.

  • @richardtowers6948
    @richardtowers6948 11 років тому +8

    I would love to see the shape of a 720 degree cut. Clearly you will get 2 pieces, but what do they look like and how do they hang together? Could this possibly be a follow up video?

  • @willfeav
    @willfeav 11 років тому

    The best bit of this video? When he puts half the bagel down at 2:28 and it lines up perfectly without him looking

  • @KingSarathos
    @KingSarathos 11 років тому +12

    So much cream cheese.... I want that bagel. This information shall be invaluable for the bakers of the future.

  • @jtn2002
    @jtn2002 11 років тому +4

    Numberphile has gone into topology! YAY!

  • @Othtsmlsgd
    @Othtsmlsgd 11 років тому +4

    Now I want a Bagel, with topologically efficient cream cheese filling. Damn you Carlo!

  • @Mivalys
    @Mivalys 11 років тому

    I can't wait to hear more from Professor Séquin!

  • @JosefHabdank
    @JosefHabdank 11 років тому +6

    The Galactic Concentrator, lol :) :)
    Gosh this guy is great :)

  • @Tilbythegreat
    @Tilbythegreat 11 років тому

    This was awesome! Looking forward to the sequel!

  • @AndorianBlues
    @AndorianBlues 11 років тому +9

    I really want a bagel now.

  • @Pinewoodpaladin227
    @Pinewoodpaladin227 11 років тому

    Wow-O-Wow!!! This is the coolest video I've ever seen about Bagels, Torus, and Circular Shapes!!! Clearly this puzzle has already surpassed the rubix cube and sphere! I wonder if it will be dubbed the name rubix cylinder or torus something.

  • @wangus
    @wangus 11 років тому +6

    this guy is hilarious.

  • @gimpthemonkey
    @gimpthemonkey 11 років тому

    Nice! I'm glad we are talking about topology and geometry. The transformations topology involves have always been mystifying to me. (I say as i stare in awe at the gif on the topology wikipedia site and try to wrap my brain around klein bottles)

  •  11 років тому +7

    Oh my God. More like this please. :P

  • @postbodzapism
    @postbodzapism 11 років тому

    Finally you do a video on toplogy... which has been long waited....

  • @NikiHerl
    @NikiHerl 11 років тому +3

    I'll make myself a few of these things as soon as someone in my vicinity gets a 3D Printer :D

  • @Lillfot
    @Lillfot 11 років тому

    Wow, Professor Séquin is very charming and funny! I'd love to see more of him!

  • @RealRaynedance
    @RealRaynedance 11 років тому +6

    Reminds me of the Samus's Morph Ball.

  • @nosuchthing8
    @nosuchthing8 11 років тому

    One of the best nphile vids yet!

  • @JimC
    @JimC 10 років тому +13

    If you do that last cut on an inner tube, you get a continuous strip of rubber with a knot in it! (source: Martin Gardner)

    • @E1craZ4life
      @E1craZ4life 10 років тому

      The 540-degree spiral cut? (a.k.a. the "Galactic Concentrator")

    • @JimC
      @JimC 10 років тому

      *****
      I meant the cut illustrated at 09:43 in the video. I'm not really a fan of fanciful names like the one you mention. :)

    • @E1craZ4life
      @E1craZ4life 10 років тому

      JimFC Gregg Yeah, that's what I meant.

  • @rogermarsh8065
    @rogermarsh8065 11 років тому

    Awesome video! Carlo is great - please do more! Plus, can you have a word with the chaps in the engineering department - I think every kitchen needs a twisted toroid bagel cutting machine!