Pizza physics (New York-style) - Colm Kelleher

[@Rynpk]

I'm embarassed that slice of pizza is likely smarter than I am.

[@3DSCRUSHER]

Your not alone on that boat

[@asston712]

+3DSCRUSHER You're*

[@nalaterswa3038]

My sister walked in on me watching this. "Why is there a talking pizza?" "Because it's explaining the physics and mathematics of pizza. Duh"

[@amankodimela8499]

ha ha

[@dald22]

nice

[@SpringTrapTheOne]

That's how you answer any question. "Because of math"

[@jacobbailey960]

Then, why is this a grammatically correct sentence: Police police police police police police police police.

[@adferxis]

+Cathy Bailey Science.

[@paulol7224]

+Spring Trap Then how is Bioluminescence created

[@kevincampbell1208]

the speed force

[@crooser64]

Is your dog dead?

[@tanishia1527]

Wonderful excuse for bringing pizza to math class

[@3DSCRUSHER]

Yep

[@jamesgoodman5102]

all this talk about pie r squared is makin me hungry

[@annyzou8312]

never have i thought that i would be taught about math by a slice of pizza

[@trevorcarlisle5447]

Never thought that i wouldn't be taught about math by a slice of pizza either

[@scottseptember1992]

That "recap" part was the most amazing/helpful part of the whole video because, everything just clicked. That's how I like to take my notes for organic chemistry, chemistry, bio, etc. Every TEDEd video should have that "recap" part.

[@lindsayhu2794]

such a cute video the voiceover actually works really well with the pizza "Hwi?" "Because of math"

[@MegaNatedog1990]

why?! why?! why?! best bit ever...!

[@Azmythometre]

Because math

[@The1TrueWaterwarrior]

0:13 "Pretty much everyone loves eating pizza" Not after *this* video they wont...

[@3DSCRUSHER]

Lol so true

[@sarans97]

WHHYY???

[@MeGaFaNdEzElDa]

-Sarah- BECAUSE OF MATH!

[@BaBooTubeVideos]

NoWaifuNoLife HWHY!

[@samtibbitts]

the lighting in this video made me uncomfortable

[@RogueDemonZ]

Try putting a piece of paper flat on a table. Bring one edge to the opposite edge, it easily creates a cylinder because they are isometric as said in the video. But now try bringing that same edge to one of its adjacent edges without letting any surface of the paper coming off of the table. It's impossible because you would have to increase the density of the inside part of the curve on the paper, and decrease the density on the outside, changing the material.

[@HeirOfGlee]

the part when he kept saying "why" I lost it. I have no clue why

[@Brahminix]

HeirOfGlee Hwi? 😂😂

[@intstantoctopus]

Thank you, sentient Irish pizza

[@amandaack3211]

A talking pizza with an accent gave me a math lesson.... O.o

[@beestenboel4614]

"WHY?! Because of math!"

[@Fewawidood]

Awesome, TEDed is one of my favorite channels on KZbin, and I am glad more people are discovering it!

[@atomicsponge3793]

a pizza giving tips on eating pizza, am i the only one that finds that uncanny?

[@manuelcastellanos9470]

You didn't mentioned the moment of inertia. Folding a pizza increases its moment of inertia making it more resistant to a bending moment.

[@theothersophie1]

I wish my teacher was a slice of pizza

[@trevorcarlisle5447]

That could be a song

[@natthekiwi7074]

They use this concept to construct stronger bridges. They taught me this in Cub Scouts surprisingly.

[@MrLC92]

I had nightmares with that piece of Pizza Face.

[@Paralars]

The lighting in this video gives me nausea

[@WalrusBubblez]

Who knew pizzas were so happy to be eaten and then pooped....

[@WalrusBubblez]

ytkdtcjhny

[@RedDeadDinosaur]

Alexander Pemberton Have you finished with your seizure?

[@Addisonmoreno]

HWY? CAUSE MATH!

[@Colenator101]

THIS IS MY FAVOURITE LESSON YET!!!

[@patu8010]

The most useful math lesson ever.

[@Thereviewer-lg6yr]

This video made me hungry.

[@s.spambot9095]

You might think this video made me smarter, but it actually made me more hungry.

[@kcoggins001]

I just use my thumb to support the pizzas tip

[@shinyemerald3401]

Kevin Coggins me too

[@yuyu8478]

"Why? Because of math" honestly my algebra teacher

[@WillBilliam]

I understood why it worked before, I couldn’t have explained it though. The recap was really good, I was a little lost, and it was exactly what I needed to get back

[@hershmysson]

that was awesome but god dammit that light @-@

[@battlemage7793]

shit now i want pizza and its 11 pm

[@koolk1dde]

youtuber royall im making pizza ill give you one here: 🍕🍕🍕🍕🍕🍕🍕☕🍕🍴🍹

[@Wardropulous]

I find, unless you're eating a gigantic slice of pizza, you can provide sufficient support using your thumb and/or other fingers to prop up the pizza along its length. This prevents cracking the crust or otherwise changing or damaging the topping of the pizza slice in any way.

[@gracecalkins6154]

Now I'm really hungry.

[@ReFreShFX]

all these colors are very distracting

[@singalo123456789]

2:50 haaaa!! that moment were you get all the pieces together

[@PrestonSmith1989]

This was the second best way of interacting with pizza that I'm aware of.

[@UberPurpleChickens]

I watch this video on half speed.

[@lxjoe96]

Why eat pizza when you can have a cool refreshing salad?

[@tony-wt1wq]

because *pizza is better*

[@RNAPolymerase]

Because salad is not isometric to pizza. Just do the math.

[@heatherswanson1664]

For the mathematical formality: You can calculate the Weingarten map at any point on the 2D surface. Intuitively this is the matrix corresponding to the change in direction of the normal vector at every point in the surface. (Normal being the vector upwards perpendicular to the surface.) For instance, if your point is at the bottom of a "u"-shaped curve, and as you move to the right the normal vector will point backwards. The Weingarten map is a matrix. The eigenvalues of the matrix are the principal curvature with the direction of the curvature given by the eigenvectors. If you place your surface like a sheet of paper on a table and define the normal to be in the upwards direction, a principal curvature of > 0 means it curves like a "u", while a principal curvature of < 0 means it curves like a "n". So a potato chip will have principal curvatures of opposite signs, both nonzero, and a ball will have principal curvatures both of the same sign, both nonzero. The side of a cylinder will have one of its principal curvatures nonzero (as it curves around the circumference) and the other principal curvature zero (as it is flat going up the side of the cylinder). The determinant of the Weingarten map (ie the product of eigenvalues) is the Gaussian curvature. It turns out all surfaces isometric to a flat surface have Gaussian curvature 0. That's what you can curve a sheet of paper (both principal curvatures are 0) into the sides of a cylinder without stretching the paper, but you can't turn it into the surface of a ball or a potato chip. That's also why the pizza trick works.

[@FrancisACNH]

I’m glad that Pizza Steve’s cousin was able to teach me isometry

[@matthew47ak]

Or you can say that the moment of inertia of the bent pizza is much greater that the moment of inertia of the slice.

[@heatherswanson1664]

That's not true. The reason this works has to do with geometric curvature.

[@pleiadiblu2365]

The moment of inertia of the section of the pizza that lies on the radius of the curved line you are trying to bend the pizza into is greater if you fold the pizza slice. Double T shaped beams and pipes work the same way.

[@aldyaljufrie]

just give me the god damn pizza!

[@thalespro9995]

Aldy Al-jufrie that pizzas mine

[@300jimmi]

This video has changed my life.

[@vedanshgupta4711]

Many pizzas were harmed in the making of this video

[@scikick]

whuiii? :D

[@irite6177]

Huuuwhy?

[@rainyfeathers9148]

*hits blunt* Watches pizza slice giving lecture on maths and physics

[@monkeymarino]

This is my favorite video of all times c':

[@fandju111]

*A kid in Africa could've eaten thiis ugly pizza*

[@symbolxchannel]

I NEVER had any problem eating pizza... This sound like a Chinese guy.... Chinese people seem to have trouble doing things like everybody... This is probably why they eat with sticks and write with drawings.

[@Eliemarieee]

He sounds vaguely Irish to me. Not at all Chinese.

[@trouts4]

wtf are you talking about holy fucking shit

[@symbolxchannel]

aypierre Pizza and Chinese people… Can't you read?

[@trouts4]

SymbolX the narrator is irish and your comment made no sense to me otherwise thanks

[@symbolxchannel]

aypierre My pleasure… :-p

[@cbpern]

3:24 - Gets me laughing every time.

[@lilipupy]

That slice of pizza is really precious for some reason...

[@PetrifiedChihuahua]

By the start of the summary I had forgot the point of everything. Lucky there was a summary.

[@averagejohnson3985]

I heard that voice on the street one day, looked over and low and behold it was indeed a pizza talking. He was eaten

[@Azmythometre]

2:48 Best part

[@FwiiChan]

I feel smarter now. Thank you, talking pizza slice.

[@ninetaledgundamx]

I say again.. I love this channel.

[@ClementMartin42]

The last why disapointed me a bit, at first isometry is "what describe the property of a square sheet of paper to become a cylinder without strenching" and then it becomes what causes a form to have such a property. I felt a bit fooled there.

[@ghosthead84]

Well, this is the 1st time physics and maths has made me hungry.

[@jerrydai5967]

R.I.P talking pizza eaten by hungry physicist we will all remember you for teaching us how to eat pizza

[@TrinityP02]

The lighting made this very unsettling.

[@lavamatstudios]

And again the true purpose of math is shown. Helping us eat pizza.

[@jojojorisjhjosef]

This made my life so much better. THANK YOU!

[@jabbalofsky]

it is only at 1:01 am that i have realised the revolutionary experience of eating your favorite type of pizza, in other words IM FUCKING HUNGRY!

[@salsie]

I like how the talking pizza say 'why' during the recap xD

[@Cyndaquazy]

You know you need help when your food starts talking math.

[@NathanHawleyCPz]

"In playlist Vsauce Leanback #11" everywherrrrrrrrrrrrrrre

[@user-mp2el7ln1n]

First live action ted ed video

[@croakerchoker504]

Well made crust is supposed to support the weight of the pizza. This is why all New Yorkers fold their pizza , good pizza has a crisp bottom that supports the toppings.

[@thedexterbros]

This is a video for people who haven't had a good slice, i.e. large, thin, not floppy.

[@ScottLoucks]

This guy has the best voice ever.

[@yosamadebam]

I love when he pops up and sais why

[@CptDobby]

Science and pizza go well together

[@612Tiberius]

About halfway through I stopped caring about the talk and just wanted a slice of pizza and some potato chips (and maybe an ice-cold beer to wash it down)!

[@MitchSevenMusic]

Never knew a talking pizza would teach me something

[@uichill]

i like that fact, that a slice of pitzza can teach me more than some of my teachers

[@grants5399]

talking pizza slice is pretty eerie.

[@somedragonbastard]

Forks. All you need.

[@somedragonbastard]

Well, I suppose also a knife.

[@pietrocelano23]

And a true italian suiciding, also.

[@red5t653]

Pietro Celano except not because I've been to Italy and there are pizzas with so little structural integrity you literally CAN'T pick them up. Mostly in Naples.

[@Adeilate]

Never though I would have physics explained to me by a piece of pizza with an accent.

[@RogueDemonZ]

Ah i get it. Its like if you have a piece of paper with its face parallel to the ground, it's easy to bend the edges or vertices downward, because the resisting material is thin. However if the paper is perpendicular to the floor, it is hard (if not impossible) to bend an edge or vertex down without bending it like before, because the resisting material is "thick" when you change the direction of bending, you effectively change the length/width dimension, into the depth dimension. OR...^^^

[@knrz2562]

Six slices,just as with the large.Though if you want 12 slices,you can cut those big pieces in half-or order two. You only live once! Do the Pizza Math..Large Pizza:14 inch with 10 slices.X-large Brooklyn Style pizza.24 in an XL?!.

[@gregaaron89]

A talking slice of pizza is teaching me about physics... a typical day on youtube O_o

[@SyphistPrime]

The song in the beginning and the end reminds me of the Song of Unhealing.

[@higofyp]

Just so you know, isometric translates as iso = same, and metric = distance. That's what isometric means at a base level. HWWHY? Because the sheet is the same distance overall even when made into a cylinder, but is not the same distance when stretched or contorted into something else like a sphere.

[@BlazeWarning]

*Writes down excuse; "Because of Math!" Me: "Brilliant!"

[@zk1273382]

That slice of pizza is smarter then my math teacher.

[@TheOfficialGnasher]

I feel like the production on this is over the top. I get a bad vibe from it that would make it difficult to watch a longer segment, or multiple segments. That's what makes things like minute physics successful. They use very simple visuals that make it easy to digest the material presented.

[@FunnyguyMV09]

I will never have this pizza problem that was never actually a problem again!!

[@jorgeartz]

That sure is a clever pizza slide.

[@lucaslayton3974]

"Hello. Domino's?"

[@Garblegox]

That pink/red lighting was super hard on the eyes, Jesus.

[@tacos394]

why? kinda lost me at all the why's at the end but overall good video :)

[@gabrielesiciliano9059]

How much stoned am I to see a pizza talking to me?

[@payno20]

Next time I eat pizza, I'll look for signs that its actually a mathematician.

[@PandaFaust]

That pizza is full of knowledge

[@adlsfreund]

MORE LIKE THIS PLEASE!!!!!!

[@XPimKossibleX]

my technique is eating the crust first, then moving down the pizza (with your fingertips spread out touching the pizza) that way by the time youve eaten the crust the pizza isnt too big and one hand is enough to hold whats letf. try it itll all make sense

[@TheBlazingshinobi]

if you eat it from the thin part first, at one point the crust will inevitably strong enough to hold in place all that's left by itself