SCIENCE CLASS #6- What if Everyone Flushed their Toilet at Once?
Let's talk about pressure! I WILL DO ONE FINAL CLASS NEXT WEEK, MAY 6TH!
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  • Mark Rober
    Mark Rober

    Thanks for coming to class!! I WILL DO ONE FINAL CLASS NEXT WEEK, MAY 6TH!

    • Itamar


    • Nicholas Roehm
      Nicholas Roehm


    • Catal




    • lol

      Please can you post everyday and reply to my comment

  • Tajr

    apparently the orbeez thing got debunked

  • Jody Milburn
    Jody Milburn

    Wish I'd had you for science class i definitely would've passed!

  • Eli Ronces
    Eli Ronces


  • Jared Crub
    Jared Crub

    Mark go get a degree in teaching and become a teacher

  • RetroNutcase

    This literally caused a nuclear meltdown in one of the Sim City scenario missions.

  • dylan sisnawan
    dylan sisnawan

    "Would you let the elephant in or the woman with high heels in" Asians: No shoes in house, elephant no have shoes so of course the elephant. *Mission failed successfully*

  • Jaunius Špokauskas
    Jaunius Špokauskas

    thank you for sharing this information :)

  • Stavan Jain, Music and games
    Stavan Jain, Music and games

    this do be better than skool tho

  • Stavan Jain, Music and games
    Stavan Jain, Music and games

    mark:...answer important questions also him: what if everyone flushed at the same time?

  • TimmyTube_9


  • Catal

    Let’s Go

  • Gavin Rosen
    Gavin Rosen

    You should do a paper airplane video

  • District Plus
    District Plus

    Become a teacher Mark

  • Hi-tech gamer
    Hi-tech gamer

    Dude you are smarter than Einstein.

  • ayden strand
    ayden strand


  • Brian Lane
    Brian Lane

    So are we not going to talk about how you didn’t put the weight directly over the balloon with 12 nails?

  • Talha Naveed
    Talha Naveed

    I love how at the end he drank water to prove there were no holes 😅👌💯

  • Sunnyzinho

    Tsunami on the sewers

  • Karol Zammit
    Karol Zammit

    I love Mark! Great job! Just curious - how many times did he say 'baby'

  • Eggy Slow mo
    Eggy Slow mo

    I'm on the other side of the world watching this

  • Jake Adams
    Jake Adams

    I bought a kiwico monthly crate got one 4/23/21 it is 5/31/21 and still waiting for the second one.

  • Joleen Wu
    Joleen Wu

    I'm only 9 and I'm hearing this....

  • Joleen Wu
    Joleen Wu


  • Joleen Wu
    Joleen Wu


  • Cody Mooney
    Cody Mooney

    Teachers in school ain't got nothing on any of this

  • Meows for Life
    Meows for Life

    I don't mean to sound to judgemental but I hope your teaching kids. If not I worry about our education system. On another note i feel saddened I didn't have a teacher like you.

  • Everett Lechner
    Everett Lechner


  • a j
    a j

    im pretty sure he only pretended to drink the water and THAT'S WHY it didnt come out.

  • Jennifer Dinh
    Jennifer Dinh

    Mark you are amzing

  • Hollis Kelly
    Hollis Kelly

    Why didn’t I get this guy is my science teacher



  • My gamer city
    My gamer city

    Thxs Now I can cheat in class lol

  • Zebbzz

    So what you're saying is never make toilets compatible with Alexa. Headline: Hackers take down water treatment plants worldwide 🌐

  • Remedy....

    You would be the teacher that kids love, learn, & remember....More educators should teach this way. It would make school & learning not only way more fun but beneficial for all....

  • J B
    J B

    isnt there a city in zimbabwe that does this all the time?

  • Tomato_man

    Another youtuber did this with the same title but before you I sense a disturbance in the force

  • Limedinosaur

    Everybody gangsta till mark rober is your science teacher

  • Natalie Karen
    Natalie Karen

    At the end I was terrified that Mark would get hurt

  • OriCraft

    This channel is slowly turning into Vsauce

  • Joseph Barton
    Joseph Barton

    On Ice. Actually slamming your foot straight down increases the coefficient of friction on your shoes so your less likely to slip. Coool.

  • Joseph Barton
    Joseph Barton

    I think you meant orientate. Orient is like Asia and stuff.

  • 152 Srikar Yendluri
    152 Srikar Yendluri

    1:51 that book costs a freaking 100 dollars in india

  • Ryan Woodhouse.
    Ryan Woodhouse.

    It would be cool if Mark was my science teacher at the Co-op I go to but... The teachers there are moms/ women

  • Ace Ggkspade
    Ace Ggkspade

    I was thinking they wouldn’t flush because of the increasing pressure in the pipes it eventually just wouldn’t let you flush but I guess if it was at exactly the same in theory lol that would be bad

  • Boo Yeah
    Boo Yeah

    Imagine all that poo coming at ya.

  • Vickie Domke
    Vickie Domke

    My science teacher is retiring next year you would be great

  • MIM Gamer TV
    MIM Gamer TV

    Mark Rober: WELCOME TO- Mark Rober Fans: OK bye!

  • Sharks r Fun
    Sharks r Fun

    Can you be my science teacher

  • L G
    L G

    What if we all slept at the same time? Even animals and bugs? Lol!!

  • Feezor Family
    Feezor Family


  • Omar Azookari
    Omar Azookari

    It’s me

  • Ano Pro Max
    Ano Pro Max

    I’m literally watching this a little more than a year after and it still helps me!

  • Ella Taylor
    Ella Taylor

    can i watch these insted of going to sience

  • Riya Tyagi
    Riya Tyagi

    But doesn't the pad of the heel create more surface area? Ohh i guess the person wearing heels puts the heel down first, oh no


    11:44 I can relate...

  • Bertha Quezada
    Bertha Quezada

    Going Vsauce here

  • Derrick h
    Derrick h

    When you said you were wrong by a factorof ten percent, did you mean you were RIGHT by a factor of ten percent? Because the weight of the elephant is distributed over a larger area.

  • Steve Lamb
    Steve Lamb

    But you didn’t explain how all the zorbies ended up in the pipes. Did he tip a few bags of them into a drainpipe or something?

  • Angel Jonguitud
    Angel Jonguitud


  • Jereimiah Knowles
    Jereimiah Knowles

    Ha ha yeah i speak german and french and you definiteley shouldnt repeat that lol 😂 22:42

  • Amy M Elliott
    Amy M Elliott

    Which one WOULD you let in your house or not let in your house? Cuz elephant would be preferred over the heals, right? Then if you said elephant then you're right! Right? Cuz the elephant distributes pressure seeing that it has a greater distribution. Right? So, was that just a mistake? Or am I confused? 3:53

  • edsnotgod

    It would be nothing compared to how much chit genius dope tokers put on the Web "duh Russian collusion"

  • Scott Ed
    Scott Ed

    It would destroy the earth’s rotation.

  • Lapiz

    I dont need sleep i need answers

  • Adam

    You showed pressure with a tub of water vs a 2liter of water and the pressure looked the same. So If one goes into a large pool 10 feet below and feels the pressure in their ears, would one feel the same pressure if they went 10 feet deep into an area of water only 5x5 wide?

  • Villa FG
    Villa FG

    I wondered this if all my toilets in my house flushed at once cool

  • Z_bonzyz

    We had this teles spark and i ordered kiwi co

  • Chris Menza
    Chris Menza

    Lol the blood on your sweatshirt

  • Snalibe

    I ain't letting an elephant in my house. I feel like the women might no be as bad!

  • Kimberly De leon
    Kimberly De leon

    As a wastewater operator, that would be a nightmare day.

  • Charlie Kay
    Charlie Kay

    but the elefant would break your door

  • pjs5406

    Did you misspeak about who to let in house elephant or woman, or did I misunderstand? You said if you chose elephant your wrong by a factor of 10, but then go on to explain how the floors would get damaged 10m times more easily with the heels than an elephant.

  • Jesus Stout
    Jesus Stout

    You are awesome!

  • A Parson
    A Parson

    I would give this man any 5th grade class in the world. When you're learning, and having fun it's full on 5th grade. My 5th grade teacher had us building balsa wood gliders and para balloons.....we had sharp scissors, sharp knives, and created amazing things. I went through three years of math in the 5th grade because we were hands on with proven designs. We got to spend more time in the field than any other class in my school..... I got so lucky by being in that teacher's space.

  • NetAndyCz

    23:54 Yeah, this part can go wrong, unless you have plate armour under the trousers, be careful;)

  • NetAndyCz

    13:08 This one really depends on how high the holes are above the ground.

  • Janice M
    Janice M

    You asked which would you let in your house but said you were wrong if you said elephant....

  • Jim Kirby
    Jim Kirby

    Mark, now that you've explained pressure, you should explain that what people call a "high-pressure shower head" is really a "low-pressure, high-velocity shower head" in accordance with Bernoulli's Theorem.

  • Jim Kirby
    Jim Kirby

    Hi Mark, in English we say "...everyone...he...." Furthermore the expression is "home in on" not "hone in on."

  • Lauren Burleigh
    Lauren Burleigh


  • StrokeMahEgo

    The fabled atomic flush

  • Q-tip

    "You see hydraulics like this in a lot of Cases." You also see them in Caterpillars, Deere's, Komatsus...

  • Nicholas Martinez
    Nicholas Martinez

    I learned more in this one video than all my years of school

    • Angel Tipanluisa
      Angel Tipanluisa

      ➡️ livegirls19. com ⤵️ B.e.S.T f'u"l'l D.a.T.i.n.G h.o.T G.i.r.L's -L-o-V-e-S-e-X---❤️😘 ..👍 !💖🖤❤️今後は気をライブ配信の再編ありがとうです!この日のライブ配信は、かならりやばかったですね!1万人を超える人が見ていたもん(笑)やっぱり人参最高!まさかのカメラ切り忘れでやら1かしたのもドキドキでした,. 💖🖤在整個人類歷史上,強者,富人和具有狡猾特質的人捕食部落,氏族,城鎮,城市和鄉村中的弱者,無`'守和貧窮成員。然而,人類的生存意願迫使那些被拒絕,被剝奪或摧毀的基本需求的人們找到了一種生活方式,並繼續將其DNA融入不斷發展的人類社會。. 說到食物,不要以為那些被拒絕的人只吃垃圾。相反,他們學會了在被忽視的肉類和蔬菜中尋找營養。他們學會了清潔,切塊,調味和慢燉慢燉的野菜和肉類,在食品市場上被忽略的部分家用蔬菜和肉類,並且學會了使用芳香的木煙(如山核桃,山核桃和豆科灌木 來調味g食物煮的時候 1618747332

  • Aubrie Waiz
    Aubrie Waiz

    thanks for your insprashon for toilets

  • Tjd


  • Marc Catalano
    Marc Catalano

    Correction water is barely compressible, but even at just the bottom of the ocean the water is a tiny bit more compressed then at the top.

  • Stormwing

    Hmm, I don't think that hole in your hoodie existed before you cushioned yourself in a bed of nails... Just sayin'

  • Eugene McCalister
    Eugene McCalister

    i used that physics book in high school, lol

  • adit vallecha
    adit vallecha

    And mark rover died in his nail experiment and was never seen again

  • Monika Galinski
    Monika Galinski


  • lMagicalMerlin

    Havn't read the comments... anyone else notice this looking like it was shot in the 80s? Almost certain it's the brick wall background.

  • Chris Leone
    Chris Leone

    I already know what happens because I conducted an experiment with my siblings when I was 6 or 7 years old where we flushed all three of our toilets at once. Your mom will yell at you and you won't be allowed on your PS2 for at least a week

  • Jim Fabian
    Jim Fabian

    I need a Mark Rober TV Show. Why hasn’t history channel or discovery signed you yet?!

  • Armon J
    Armon J

    The eager doubt lamentably refuse because girdle realistically greet versus a hallowed female. thin, internal instruction

  • HM

    Mark is the BEST

  • Philip Beach
    Philip Beach

    Are you the coolest nerd, or the nerdiest cool guy on ISdowns?? I don't know, but I do know that everyone will know who Mark Rober is someday. 🤟keep inspiring the way you do

  • Alex Ortiz
    Alex Ortiz

    The cynical profit incidentally label because phone aesthetically stay from a slimy llama. stiff, dispensable jail

  • Privacy Valued
    Privacy Valued

    The elephant would literally become the elephant in the room and while my floors would be fine, the rest of the residence would cease being a residence. Just ask the lady to take her shoes off when she enters the residence or don't let either one in and then there's no problem.

  • Robert Triggs
    Robert Triggs

    Keep it up bro! Best videos I've probably ever seen.