SCIENCE CLASS #6- What if Everyone Flushed their Toilet at Once?


  1. Mark Rober

    Mark Rober

    Year ago

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

    • Itamar


      7 days ago


    • Nicholas Roehm

      Nicholas Roehm

      10 days ago


    • Catal


      Month ago




      Month ago


    • lol


      Month ago

      Please can you post everyday and reply to my comment

  2. Jared Crub

    Jared Crub

    Day ago

    Mark go get a degree in teaching and become a teacher

  3. RetroNutcase


    10 days ago

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

  4. dylan sisnawan

    dylan sisnawan

    21 day ago

    "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*

  5. Jaunius Špokauskas

    Jaunius Špokauskas

    Month ago

    thank you for sharing this information :)

  6. Stavan Jain, Music and games

    Stavan Jain, Music and games

    Month ago

    this do be better than skool tho

  7. Stavan Jain, Music and games

    Stavan Jain, Music and games

    Month ago

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

  8. TimmyTube_9


    Month ago


  9. Catal


    Month ago

    Let’s Go

  10. Fenrick Brandoff

    Fenrick Brandoff

    Month ago

    Welcome to science class! I’m mark rover Well done captions

  11. Gavin Rosen

    Gavin Rosen

    Month ago

    You should do a paper airplane video

  12. District Plus

    District Plus

    Month ago

    Become a teacher Mark

  13. Hi-tech gamer

    Hi-tech gamer

    Month ago

    Dude you are smarter than Einstein.

  14. ayden strand

    ayden strand

    Month ago


  15. Brian Lane

    Brian Lane

    Month ago

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

  16. Talha Naveed

    Talha Naveed

    Month ago

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

  17. Sunnyzinho


    Month ago

    Tsunami on the sewers

  18. Karol Zammit

    Karol Zammit

    Month ago

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

  19. Eggy Slow mo

    Eggy Slow mo

    Month ago

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

  20. Jake Adams

    Jake Adams

    Month ago

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

  21. Joleen Wu

    Joleen Wu

    Month ago

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

  22. Joleen Wu

    Joleen Wu

    Month ago


  23. Joleen Wu

    Joleen Wu

    Month ago


  24. Cody Mooney

    Cody Mooney

    2 months ago

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

  25. Meows for Life

    Meows for Life

    2 months ago

    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.

  26. Everett Lechner

    Everett Lechner

    2 months ago


  27. a j

    a j

    2 months ago

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

  28. Jennifer Dinh

    Jennifer Dinh

    2 months ago

    Mark you are amzing

  29. Hollis Kelly

    Hollis Kelly

    2 months ago

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



    2 months ago


  31. My gamer city

    My gamer city

    2 months ago

    Thxs Now I can cheat in class lol

  32. Zebbzz


    2 months ago

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

  33. Remedy....


    2 months ago

    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....

  34. J B

    J B

    2 months ago

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

  35. Tomato_man


    2 months ago

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

  36. Limedinosaur


    2 months ago

    Everybody gangsta till mark rober is your science teacher

  37. Natalie Karen

    Natalie Karen

    2 months ago

    At the end I was terrified that Mark would get hurt

  38. OriCraft


    2 months ago

    This channel is slowly turning into Vsauce

  39. Joseph Barton

    Joseph Barton

    2 months ago

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

  40. Joseph Barton

    Joseph Barton

    2 months ago

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

  41. 152 Srikar Yendluri

    152 Srikar Yendluri

    2 months ago

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

  42. Ryan Woodhouse.

    Ryan Woodhouse.

    3 months ago

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

  43. Ace Ggkspade

    Ace Ggkspade

    3 months ago

    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

  44. Boo Yeah

    Boo Yeah

    3 months ago

    Imagine all that poo coming at ya.

  45. Vickie Domke

    Vickie Domke

    3 months ago

    My science teacher is retiring next year you would be great

  46. MIM Gamer TV

    MIM Gamer TV

    3 months ago

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

  47. Sharks r Fun

    Sharks r Fun

    3 months ago

    Can you be my science teacher

  48. L G

    L G

    3 months ago

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

  49. Feezor Family

    Feezor Family

    3 months ago


  50. Omar Azookari

    Omar Azookari

    3 months ago

    It’s me

  51. Ano Pro Max

    Ano Pro Max

    3 months ago

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

  52. Ella Taylor

    Ella Taylor

    3 months ago

    can i watch these insted of going to sience

  53. Riya Tyagi

    Riya Tyagi

    3 months ago

    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

  54. MARK WON


    3 months ago

    11:44 I can relate...

  55. Bertha Quezada

    Bertha Quezada

    3 months ago

    Going Vsauce here

  56. Derrick h

    Derrick h

    3 months ago

    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.

  57. Steve Lamb

    Steve Lamb

    3 months ago

    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?

  58. Angel Jonguitud

    Angel Jonguitud

    3 months ago


  59. Jereimiah Knowles

    Jereimiah Knowles

    3 months ago

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

  60. Amy M Elliott

    Amy M Elliott

    3 months ago

    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

  61. edsnotgod


    3 months ago

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

  62. Scott Ed

    Scott Ed

    3 months ago

    It would destroy the earth’s rotation.

  63. Lapiz


    3 months ago

    I dont need sleep i need answers

  64. Adam


    3 months ago

    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?

  65. Villa FG

    Villa FG

    3 months ago

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

  66. Z_bonzyz


    3 months ago

    We had this teles spark and i ordered kiwi co

  67. Chris Menza

    Chris Menza

    3 months ago

    Lol the blood on your sweatshirt

  68. Snalibe


    3 months ago

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

  69. Kimberly De leon

    Kimberly De leon

    3 months ago

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

  70. Charlie Kay

    Charlie Kay

    3 months ago

    but the elefant would break your door

  71. pjs5406


    3 months ago

    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.

  72. Jesus Stout

    Jesus Stout

    3 months ago

    You are awesome!

  73. A Parson

    A Parson

    3 months ago

    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.

  74. NetAndyCz


    4 months ago

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

  75. NetAndyCz


    4 months ago

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

  76. Janice M

    Janice M

    4 months ago

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

  77. Jim Kirby

    Jim Kirby

    4 months ago

    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.

  78. Jim Kirby

    Jim Kirby

    4 months ago

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

  79. Lauren Burleigh

    Lauren Burleigh

    4 months ago


  80. StrokeMahEgo


    4 months ago

    The fabled atomic flush

  81. Q-tip


    4 months ago

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

  82. Nicholas Martinez

    Nicholas Martinez

    4 months ago

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

    • Angel Tipanluisa

      Angel Tipanluisa

      3 months ago

      ➡️ 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

  83. Aubrie Waiz

    Aubrie Waiz

    4 months ago

    thanks for your insprashon for toilets

  84. Tjd


    4 months ago


  85. Marc Catalano

    Marc Catalano

    4 months ago

    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.

  86. Stormwing


    4 months ago

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

  87. Eugene McCalister

    Eugene McCalister

    4 months ago

    i used that physics book in high school, lol

  88. adit vallecha

    adit vallecha

    4 months ago

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

  89. Monika Galinski

    Monika Galinski

    4 months ago


  90. lMagicalMerlin


    4 months ago

    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.

  91. Chris Leone

    Chris Leone

    4 months ago

    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

  92. Jim Fabian

    Jim Fabian

    4 months ago

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

  93. Armon J

    Armon J

    4 months ago

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

  94. HM


    4 months ago

    Mark is the BEST

  95. Philip Beach

    Philip Beach

    4 months ago

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

  96. Alex Ortiz

    Alex Ortiz

    4 months ago

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

  97. Privacy Valued

    Privacy Valued

    4 months ago

    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.

  98. Robert Triggs

    Robert Triggs

    4 months ago

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

  99. Victoria of the Victoria Victoria's

    Victoria of the Victoria Victoria's

    4 months ago

    I'm 3:12 in & I've learned more than I have in the last 10 years....

  100. loe 73

    loe 73

    4 months ago

    thanks mark, for showing that schools can incorporate more interactive and engaging learning. Rather than giving students a thick text book, a load of assignments, and expect them to learn efficiently and last in their heads.