SCIENCE CLASS #1- WHY Does Helium Make Your Voice Higher?

Live stream with demos your brain will enjoy where we answer a basic question every time.
Does farting make you weigh more or less?!?! Place your guess and give me feedback too-


  • Mark Rober
    Mark Rober9 ditë më parë


  • Unicorn Butt face

    Unicorn Butt face

    8 ditë më parë


  • Érika Matteau

    Érika Matteau

    8 ditë më parë


  • Érika Matteau

    Érika Matteau

    8 ditë më parë


  • Érika Matteau

    Érika Matteau

    8 ditë më parë


  • Érika Matteau

    Érika Matteau

    8 ditë më parë


  • Savage League
    Savage LeagueOrë më parë

    Now this is what I call education all the science channels I watch have taught me more that I've ever learned in school

  • L4W4ND
    L4W4ND3 orë më parë

    At <a href="#" class="seekto" data-time="187">3:07</a> listen to his voice

  • Chloe Sanders
    Chloe Sanders6 orë më parë

    I don’t know why but the way he dresses, like with the hat and suit jacket thingy, reminds me so much of Cisco from Flash

  • Rebecca Alexander
    Rebecca Alexander6 orë më parë

    The 1k who disliked this vid hate on of these: School Physics ALlist Life Science you see that I didn’t put Mark Rober. No one can hate him

  • Rebecca Alexander
    Rebecca Alexander6 orë më parë

    I want you as my high school physics teacher

  • rcvidu-
    rcvidu-7 orë më parë

    Best teacher we could have

  • Ash
    Ash7 orë më parë

    I use SF6 for W etching in a nano fabrication cleanroom facility. Don't remember the MSDS saying is could be inhaled :)

  • Liam Foster
    Liam Foster7 orë më parë

    this is AWESOME!!

  • Austin Jackson
    Austin Jackson11 orë më parë

    Love the explanation of traveling sound. This is why there’s no sound in outer space!!

  • Altidudes
    Altidudes12 orë më parë

    Are you still livestreaming?

  • Terri Griffith
    Terri Griffith15 orë më parë

    As a middle school Science teacher. Got to say - love this! Thank you.

  • David Cusack
    David Cusack16 orë më parë

    do why is water wet

  • The Real Benjamin
    The Real Benjamin18 orë më parë

    Mark’s upload schedule before Coronavirus: Once a month Mark’s upload schedule now: Multiple videos in a month

  • LifeAsANoun
    LifeAsANoun18 orë më parë

    Sooooo... I don't know about your conclusion. ◸ ◹ A test: *you'll need a highspeed camera and an airtight box filled with the different mediums* Tap a tuning fork within the medium. ◺ ◿ Look at how quickly the tuning fork vibrates in each medium. Get another trillion views. Sound travels faster in helium than in "air" (the mixture of [mostly] nitrogen and oxygen we normally breathe). The velocity (v) of a sound wave is equal to its wavelength (λ) multiplied by its frequency (f), v = fλ. The speed of sound in normal air is ~345 meters per second. In helium that speed is ~1007 meters per second, and ~134 meters per second for sulfur hexafluoride. My hypothesis: Your vocal cords aren't moving faster or slower -- the frequency of your vocal cords' motion stays the same -- the energy transmitted from the vibrating vocal cords is being applied to the different mediums. This changes the speed of the sound wave. By changing the medium (the atmosphere) a sound wave travels faster or slower. The frequency of the vocal cords' motion remains unchanged, but the speed the waves are carried away through the various mediums do. I love your work.

  • Mombie Chronicles
    Mombie Chronicles20 orë më parë

    Great job Teach’

  • Jeremy Hatch
    Jeremy HatchDitë më parë

    Mark:I am doing what i can Everyone: this is better than regular science class

  • Daniel Middleton
    Daniel MiddletonDitë më parë

    That’s a Skelator shiirrrrrttt!!!!

  • Kerry fyi
    Kerry fyiDitë më parë

    Thanks Mark Rober, you're keeping me sane

  • Matty k
    Matty kDitë më parë

    farting does help you loose weight

  • Dali Brabec
    Dali BrabecDitë më parë

    the corona viris is stinky

  • Rhiannyn Reynolds
    Rhiannyn ReynoldsDitë më parë

    i was NOT prepared for that giant air horn ....

  • Jacinth
    JacinthDitë më parë

    You missed the opportunity to say 'ma in the chat' instead of 'F in the chat' because F=ma

  • mrn. gr.
    mrn. gr.Ditë më parë

    <a href="#" class="seekto" data-time="80">1:20</a> 👌

  • Rodney Bentley
    Rodney BentleyDitë më parë

    I move that the Imperial Measuring System heretofore be renamed "Freedom Units"

  • Shattering Diamond
    Shattering DiamondDitë më parë

    He was so nervous and kept bringing up this is live.

  • Crue Bundy Outdoors
    Crue Bundy OutdoorsDitë më parë

    come on mark give me a shout out pls

  • Samuel Thompson
    Samuel ThompsonDitë më parë

    Insta-subbed. The presentation here is extraordinary.

  • Jim hobbs
    Jim hobbsDitë më parë

    This is a kind of back handed compliment, you come across so much better live, I used to find you a bit to cocky, but live you're humble self shines through.

    DYLAN PERRYDitë më parë

    Who else thought that the first 5 seconds were in slow motion

  • Samuel Simons
    Samuel SimonsDitë më parë

    I don't think God created the universe like that

  • Raagul Suresh Babu
    Raagul Suresh BabuDitë më parë

    Hey Mark can you make a video on the world's lightest solid

  • Cristi Macovei
    Cristi MacoveiDitë më parë

    that's literally the best explanation i've ever heard keep up the good work my guy

  • andrew calhoun
    andrew calhounDitë më parë

    I Show my teacher dis

  • TysenTJF !
    TysenTJF !Ditë më parë

    I have always wanted a science teacher like you I am a middle schooler

  • DJ 44455
    DJ 44455Ditë më parë

    The next Eddie Woo

  • DannyJ Fedora
    DannyJ FedoraDitë më parë

    My science teacher put this on our online class. This is the first thing on this. This is the best science class ever.

  • xX Galaxy Studios Xx
    xX Galaxy Studios XxDitë më parë

    I already watch Mr.Beast he is amazing

  • Breanna Y
    Breanna Y2 ditë më parë

    Why does your stomach growl and how can you hear the water in ur stomach when you exercise

  • Jon Lon
    Jon Lon2 ditë më parë

    When a pilot breaks the sound barrier does he/she hear the sonic boom? Also, while traveling faster than the speed of sound does a pilot hear sound from the jet engine?

  • Breanna Y
    Breanna Y2 ditë më parë

    I have a question how does whistling work?

  • Dirks The Immortal
    Dirks The Immortal2 ditë më parë

    It Would be so cool to have mark rober as ur science teacher

  • Mick dot com
    Mick dot com2 ditë më parë


  • Kaeden Dansereau
    Kaeden Dansereau2 ditë më parë

    Mark why didn't the helium balloons float?

  • Brennen Wright
    Brennen Wright2 ditë më parë

    So, in a way does that mean that people with lower pitched voices just have "weaker" or "slower" vocal cords because they're moving air slower than the vocal cords of someone with a higher pitch voice? Or is this concept different when referring to just the regular voice of a person.

  • Christopher Acosta Simon
    Christopher Acosta Simon2 ditë më parë

    I would love to have Mark as my physics teacher.

  • Christopher Acosta Simon
    Christopher Acosta Simon2 ditë më parë

    Chalk drop *he drops the chalk which makes the first one collide with the second one and the second one drops to the ground* Chained reactioned chalk drop Science y'all

  • Jon Deneen
    Jon Deneen2 ditë më parë

    I think Mark needs to be teamed up with Elon Musk

  • Jon Deneen
    Jon Deneen2 ditë më parë

    I quote "From the drug world it's like uppers and downers" -T. McKenna

  • taylor patton
    taylor patton2 ditë më parë

    Oh that’s why your voice is lower in slow motion and higher when it’s sped up

  • The Turtle Person
    The Turtle Person2 ditë më parë

    Mark Rober: "Teaching High School physics is like my dream job" Also Mark: "I hate public speaking" Should we tell him?

  • Joel
    Joel2 ditë më parë

    I had the AH HA moment and I LOVED IT That’s so coooollllll

  • Vghs. Go gxf. Games
    Vghs. Go gxf. Games2 ditë më parë

    The Big Bang can’t actually happen

  • Kris Kirby
    Kris Kirby2 ditë më parë

    Thank you your videos are awesome and I enjoy watching your videos and look forward to them ( also when we started the space unit I got excited and taught the class about the part of the rover you built/helped build) keep going stay safe

  • reesa beee
    reesa beee2 ditë më parë

    cool bro... my daughter will be stocked up on science projects ..

  • wy
    wy2 ditë më parë

    you look so scared 🤣 I feel bad

  • Desert Fresh
    Desert Fresh2 ditë më parë

    Mark's such a great teacher. He even left the mouse on the screen while showing a video!

  • v KEITH v
    v KEITH v2 ditë më parë

    1<a href="#" class="seekto" data-time="301">05:1</a> like to dislike ratio... *everybody liked that*

  • Damonion Katsby
    Damonion Katsby2 ditë më parë

    Thank you so much for doing this you are awesome

  • Max Ellis
    Max Ellis2 ditë më parë

    Me and my family have been offering to buy our elderly next door neighbours their shopping.

  • Sarah Chen
    Sarah Chen2 ditë më parë

    If he was going to be a teacher I would really want to be in his class

  • christian hirwa
    christian hirwa2 ditë më parë

    this is better than my brain

    WOOGTSAR2 ditë më parë

    For all of you who wanted him as his science teacher, there you go.

  • ME PS3D
    ME PS3D2 ditë më parë

    So he is going to be someone’s teacher I’m jealous

  • f trouvé
    f trouvé2 ditë më parë

    best teacher, thank you so much

  • Tasia Hampton
    Tasia Hampton2 ditë më parë

    You are genuinely the best person on ALlist. No other channel compares to this one

  • Tasia Hampton

    Tasia Hampton

    2 ditë më parë

    Ok maybe except mr.beast

  • Diaz055
    Diaz0552 ditë më parë

    Learned more from this video than my hs class.

  • H Carol
    H Carol2 ditë më parë

    Thank you so much for doing these videos!!!

  • Andy Hi
    Andy Hi2 ditë më parë

    Anyone notice the red balloon slowly shrinks

  • Davii5
    Davii52 ditë më parë

    so this means that someone with low voice talks slower than someone with a high pitch voice because of physics??

  • K-Tar
    K-Tar2 ditë më parë

    Mark would be a perfect teacher because he forgets the mouse on the screen.

  • Wiggle Wiggle Are Made of This
    Wiggle Wiggle Are Made of This2 ditë më parë

    Oh, hi Mark! I like your humble approach to photosynthesis and biologic sciences in general, it says you know what's going on. To me the saying "knowing things takes the magic of it" seems like a missconception about a missconception. Compared to other fields (and always, with caution trying to make fair comparisons) advanced biology it's a very chaotic, emergent, integrative and with many no-answers field. Just the example about how an organism derivated from LUCA started using the energy from the sun in the most efficient way, invaded Pangea and became the most prolific organism on the entire planet, with complex mechanism and variability to reproduce itself wich involves a co-dependent evolution with other movil species such as animal kingdom, to end being the freaking plant ripping the water molecule and bringing oxygen we know from school. The more you know about specifics of photosyntesis, the more impressive it becomes (and the same goes to microbiology in general). I also appreciate your exposition about going live, you are going well. Congratulations about this initiative and keep it up.

  • Nafhoon The Ninja
    Nafhoon The Ninja2 ditë më parë

    Why is he looking under the camera Is he looking at words?

  • Nafhoon The Ninja
    Nafhoon The Ninja2 ditë më parë

    You make my life amazing

  • Alejandro Jimenez
    Alejandro Jimenez2 ditë më parë

    Wow i loved it 🤯

  • Dr. Adam
    Dr. Adam2 ditë më parë

    Mark- Ark and cause a spark... Me: ENGLISH CLASS PLUS SCIENCE!!!

  • Dr. Adam
    Dr. Adam2 ditë më parë

    Mark: 15 mins long Me- plus 20

  • Hi Welcome
    Hi Welcome2 ditë më parë

    When you inhale helium , you sound very weird on <a href="#" class="seekto" data-time="76">1:16</a>

    NAOMI STOLTZFUS2 ditë më parë

    why are you not a teacher

  • It'sCyan
    It'sCyan2 ditë më parë

    You can tell Mark’s gonna make a fine teacher by the way he keeps the cursor on the screen while the video plays

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