Super Saturated Solutions :0

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  • Опубліковано 3 січ 2025

КОМЕНТАРІ • 218

  • @fednis
    @fednis 12 років тому +158

    I much prefer these American overly-dramatic reactions than some other teenagers who couldn't care less and don't react at all. These guys truly appreciate the beauty of chemistry.

  • @yanca257
    @yanca257 10 років тому +427

    A lot of these comments say these kids are "annoying," but in my chemistry class, hardly anyone appreciates experiments and labs like this or even pays attention at all... My teacher would probably be overjoyed if these kids were her students tbh

    • @veddygud1775
      @veddygud1775 7 років тому +2

      As annoying as they are, there are definitely more annoying people in my class this year.

    • @zes7215
      @zes7215 6 років тому

      no such thing as annox or not, doesn't matter, idts

    • @williambarney4799
      @williambarney4799 5 років тому

      FALSE NO U

    • @tiffanychildress1509
      @tiffanychildress1509 4 роки тому +2

      Absolutely. What they're doing is called "engagement". Education researchers, teachers, policy makers ALL care about this. Engagement=learning (even if not captured in a standardized test)

    • @tula__
      @tula__ 3 роки тому

      That's coz prolly their teachers aren't that strict and students can freely express. You see they are filming with their phones. Our school didn't "allow" phones in premises.

  • @colelawrence7461
    @colelawrence7461 6 років тому +34

    Idk why but I’m getting real nostalgic feelings of high school watching this..

  • @dragongirl7978
    @dragongirl7978 4 роки тому +16

    Hahahaha this is SO the science class I'm teaching right now. "Can we touch it?" "Are you going to break off pieces and give them to us?" I'm dying :DD

  • @katieprescott4944
    @katieprescott4944 6 років тому +63

    This is so wholesome.

  • @martinda7446
    @martinda7446 7 років тому +25

    I loved the reaction from the class. It was nice to hear the excitement and enthusiasm. Dunno why so many comments are negative here.

  • @m3lls34
    @m3lls34  12 років тому +34

    The water is a supersaturated solution, meaning it has more salt than it can actually hold. He dropped in a salt crystal, which triggered the reaction.

    • @rannaghoremoumita926
      @rannaghoremoumita926 4 роки тому +2

      That's not a reaction.....it's crystallization

    • @chenerrera9158
      @chenerrera9158 4 роки тому

      @@rannaghoremoumita926 I have a question - did the supersaturated solution is made out of dissloved Rochlle salt as well? or other ingredients are added to it? I am trying to do this process in order to present it in class. tnx.

    • @AnUglyBarnacle
      @AnUglyBarnacle 4 роки тому

      these kids are pretty old now, huh?

    • @LoLlamaWTM
      @LoLlamaWTM Місяць тому

      ​​​@@chenerrera9158just mainly distilled water and salt, you heat the water up so it dissolves more salt than it can hold at room temperature, then you carefully cool it down, because distilled water almost doesn't have impurities in it, it doesn't crystallize because it lacks it. So you just drop in something on the solution and it triggers crystallization.

  • @bittertea
    @bittertea 3 роки тому +4

    I did this experiment in class in college. In high school, I can understand the against of not being able to do experiments. Being told that "the regents are old" or there is "no budget." Teacher is such a nice guy.

  • @TonecrafteLuthiery
    @TonecrafteLuthiery 9 років тому +12

    My science teacher showed me this exparament like 5 years ago and I haven't been able to find it since then. If I paid attention I might have been able to do it myself.

  • @GBHS_Iain
    @GBHS_Iain Рік тому +1

    Greetings from Green Bay High School. We are watching this in class :)

  • @samscomments6422
    @samscomments6422 9 років тому +22

    I always thought that was just a "textbook" idea. Never thought it would be possible to find a beaker manufactured so perfectly as to not have the tiniest flaw to prematurely seed the crystallization.

    • @777shadowdragon
      @777shadowdragon 8 років тому +5

      its not THAT unstable u just have to guess and check to find the right ratio my chem teacher did it for us too

    • @lesgoddam1949
      @lesgoddam1949 8 років тому +6

      It's actually pretty easy to do this. The reason why the nucleation doesn't occur on imperfections in the glassware is just to do with the activation barrier of crystallisation. Even though it's a tiny barrier, you need something to provide that energy, or a lower pathway. Adding the crystal tips it over the edge.

  • @Number2TakeThat
    @Number2TakeThat 12 років тому +5

    How are these kids annoying? They're so mesmerized and excited from such a simple experiment that it's actually pretty cute if you ask me. I know this is the internets and anything goes but I really don't understand why you would say something mean like that. You could just keep it to yourself.

  • @Skunkhunt_42
    @Skunkhunt_42 6 років тому +37

    "Because I boiled it"

    • @smow7422
      @smow7422 6 років тому +1

      JM Herring underrated

    • @jackcayman3273
      @jackcayman3273 5 років тому +2

      Then he immediately drops the crystal in to avoid having to explain it. I don't blame him, I have no idea how it works.

    • @beb1684
      @beb1684 5 років тому +6

      What I know is that boiling a solution allows it to hold more solute, so you boil it and put more solute in it and then cool it down and keep it so the solution is only kept in a smooth container so it can’t latch onto anything. That’s why the crystal being dropped in causes the huge crystallization, because the crystals can only form if they have something to start with

    • @Freezo90967
      @Freezo90967 5 років тому

      read about it, says you need to rapidly cool it too since a slow cool could cause crystalization

    • @meisheet
      @meisheet 4 роки тому

      Freezo Productions but im learning about this right now and my notes say that you have to cool it down slowly. Then are there some exceptions to the process?

  • @bassforhire555
    @bassforhire555 3 роки тому +1

    We did this twice in my chem class, once with salt and once with sugar. Boiled the solution till it couldn't hold any more salt or sugar, dunked the glass wear in ice to rapidly cool it, then dropped a single extra crystal in the top. Shit has stick with me for 15 years, so frickin cool

  • @Ace0077
    @Ace0077 10 років тому +6

    if only I had got this much excitement from the class lol

  • @broswirski4513
    @broswirski4513 6 років тому +13

    This is what school looks like when it is working

  • @TedParker23
    @TedParker23 Рік тому +1

    Teacher made us watch this 😂😂😂 these Americans’ reactions are so funny if my teacher did this no one would really care

  • @Stucrompton1
    @Stucrompton1 4 роки тому +24

    thumbs up if you’re here from rule 9 j.b.peterson

  • @grave0x
    @grave0x 3 роки тому

    you guys have a great teacher showing you cool experiments like this

  • @kingpsyqi4051
    @kingpsyqi4051 5 років тому +38

    Where Jordan Peterson got the name Ms. S from lol

  • @Psycho0124
    @Psycho0124 12 років тому +1

    The solution is sodium acetate. You eat this stuff when you munch Salt n' Vinegar chips. To make it, slowly stir baking soda into vinegar in a pan until you can't dissolve any more. Simmer the resulting liquid to concentrate it until you start seeing crystals form on the surface. Pour the solution into another container and fridge it until cold. Take one of the crystals from the pan and drop it into the solution to make it "freeze". Melt over heat to reuse.
    Fun experiment. Safe ingredients.

  • @BanaCubed
    @BanaCubed Рік тому +1

    11/10 - Life changing.

  • @davidholland4489
    @davidholland4489 6 років тому

    from student to student i can thankyou for being so enthusiastic about science, most kids would like to hang out and procrastinate but you all are jumping all in. and also when people leave mean and degrading comments on here, it is because they think that they are smart and since no body acknowledges them they bring it upon themselves to put other people down so they can re-asure themselves of their fake status.

  • @courtneyraker9218
    @courtneyraker9218 2 роки тому +2

    These kids are soooooo AWESOME!

  • @TheMaviene
    @TheMaviene 6 років тому +1

    Dr. Ted seems like a chill dude.

  • @maldscientist6965
    @maldscientist6965 10 років тому +1

    you can also do that using Na2S2O3(sodium thiosulphate)

  • @bahunlnongrum7010
    @bahunlnongrum7010 Місяць тому

    1:04 justin bieber on crack😂😂😂

  • @thegreatautismo224
    @thegreatautismo224 4 роки тому +5

    "You wanna see my nail? I want my nail to be in the picture"
    bruh

  • @Psycho0124
    @Psycho0124 12 років тому

    If there are any crystals in the solution, it will freeze as it cools. Saturation depends on temperature and to get a flash freeze like this, there must be no nucleation sites in the solution or container.

  • @rannaghoremoumita926
    @rannaghoremoumita926 4 роки тому +1

    Why it releases heat? Is it exothermic? Yes it is...infact if you see it in this way in normal conditions, more solute cannot dissolve in the supersaturated soln. But when we supply heat it absorbs it and dissolves ....thus it is endothermic
    However the soln is very unstable.
    Thus, when we cool it or add a grain of salt it crystallizes and the energy it had absorbed is now released....thus it is exothermic
    This is my interpretation...🙏🙏
    you can have your own...

  • @mdarbor
    @mdarbor 11 років тому +6

    What was the Molarity used?

    • @sahibjitguraya3215
      @sahibjitguraya3215 5 років тому +1

      take a shit ton of salt in normal water and keep adding more until you have a big ass clump at the bottom. It is now oversaturated. Take that salty ass water and dump that shit into a pot and boil it. Pour it into a new clean glass and let it cool down without any movement. voila, you have now made a supersaturated solution, no need for molarity!

    • @squirrelydan3
      @squirrelydan3 2 роки тому

      Wow I haven't thought about mols since high school, but this just brought me back.

    • @Jeagletboard
      @Jeagletboard Місяць тому

      @@sahibjitguraya3215 nice

  • @Taahmim
    @Taahmim 5 років тому +1

    I was not ready to see this!
    Its awesome

  • @KonichiWawa
    @KonichiWawa 10 років тому +5

    I need help, I am posting on any crystal growing you tube sites I can find. I have successfully grown some large and beautiful Mono Ammonium Phosphate and Copper Sulfate Pentahydrate crystals. I am talking about large multi crystal clusters that are amazing. From one orange tinted fully symmetrical crystal that resembles a flower opening to a big green multi stalagmite specimen that weighs in at two pounds. I started doing this about five months ago and I was receiving help from my central air unknowingly. A burst pipe in the floor slab which also contained the air ducts put a big halt to that. I went and bought a big dehumidifier for my room after the leak was fixed (even though we think there are literally tons of water still draining off) and began again. The problem is dehumidifiers exhaust hot dehumidified air and I didn’t understand how tenuous the relation is between temperature and saturation. I need help finding what is the perfect temperature and relative humidity to continue doing what I have come to love.

    • @Rueyful
      @Rueyful 10 років тому +3

      Run a design of experiments, should be easy with only two factors. :)

    • @KonichiWawa
      @KonichiWawa 10 років тому +2

      Rueyful It is now winter and I decided to keep the vent shut in "the" room and run the hell out of the dehumidifier. I had solved my problem earlier by picking up a small window air conditioner and then having the dehumidifier in front. I wanted to try sitting a small rotating fan on top of the dehumidifier and see how that worked when it slipped behind it partially. It actually ended up with the circular fan cage on top of the dehumidifier right in front of the ac and I got a cool very low humidity breeze. This worked all too well and in fact just a bit too much as the parasitic growth became a massive PITA. Crystals pushed to grow too fast become cloudy as well forcing the use of color. The problem so far this winter has been on days where it warms up too much and I let the temps fluctuate too much/too quickly and I was having problems again. I have worked it out and now have some beautiful massive specimens, but still have to be very careful. I wish i had an actual lab to work in. Thanks for the input since not many take the time to try and help.

  • @dushanpersaud2925
    @dushanpersaud2925 3 роки тому

    This class and This Teacher Are GOATED

  • @tobiasmoser3134
    @tobiasmoser3134 11 років тому +3

    which crystales are this and is that also possible with NaCl or sugar?

    • @julietambros6438
      @julietambros6438 5 років тому

      No, I don't think so

    • @Freezo90967
      @Freezo90967 5 років тому +1

      with sugar yeah and they used some salt in the video so probably

  • @toniarner7791
    @toniarner7791 9 років тому +1

    Where can I get sodium acetate?

  • @Johnsonian49
    @Johnsonian49 11 років тому +2

    "Zoom in Rena... move closer."

  • @civus
    @civus 3 роки тому

    Isn't this another proof of one of Hegel's 3 Classical laws of dialectics??? Viz: An Accumulation of quantitative change will produce at a certain juncture a qualitative transformation.

  • @dr.rajdutt2621
    @dr.rajdutt2621 4 роки тому

    Hey could someone explain why it kinda solidifies. Is it a seed crystal he added??
    I got the fact that the crystal attracts the excess sugar but why does it solidify. I mean are the attraction forces so strong....as in ionic force strong?? And.. why did it not settle down into its natural saturated state ...or did it and we could not see it??????

    • @kevindunbar7141
      @kevindunbar7141 3 роки тому +1

      it is supersaturated, meaning it has more crystals dissolved in it than it really should be able to hold at room temperature. just adding one bit of the crystal gives it something to crystalize to and ta da.

  • @fsl5050
    @fsl5050 13 років тому

    what is in the beaker like a water and what was he dropped in it????????????/

  • @fredricksonthe96th
    @fredricksonthe96th 4 роки тому

    Cool teachers are the best. They're what society needs.

  • @CloneHat
    @CloneHat 11 років тому +2

    AP class: "Is it real? Can we touch it?"
    *shudders*

  • @elenacoww
    @elenacoww 11 років тому +62

    some people have no sense of excitement or appreciation for wonder. they're students. regardless of where you're from, this shit is cool and 90% of the students in a class (ANYWHERE IN THE WORLD) watching an exciting experiment would be just like these guys here. "ego" has nothing to do with this. if anything, it's everyone being rude and talking shit about these kids that has an ego problem.
    just because you're not american doesn't automatically mean you're better. get over yourselves.

    • @我弱
      @我弱 3 роки тому

      But as a Asian, I always thought being a American is much nicer than being a Asian...

  • @Farmmon
    @Farmmon 2 роки тому

    Seems like a great teacher

  • @LUV1299
    @LUV1299 6 років тому +2

    This video is so wholesome

  • @luxianolee7497
    @luxianolee7497 10 місяців тому

    We watched this in class, super cool

  • @josueemmanuel2570
    @josueemmanuel2570 9 років тому +8

    Why and how did that happen? Its so awesome.

    • @HaemDream
      @HaemDream 9 років тому +18

      Josue Emmanuel Firstly, solvents like water have a limit to the amount of solute (like the sodium acetate used in the video) that can dissolve into it. Once this limit is reached the solution is now saturated. Imagine that it runs out of "room" to fit the solute in.
      However this limit depends on the temperature of the solvent. Heat it up and the limit increases i.e. more can be dissolved. As the doctor said in the video, he boiled the water. He then would have dissolved as much solvent as possible in it (i.e. he made a saturated solution) before allowing the solution to cool back to room temperature.
      But ah, now that the solution is at room temperature, it should not be able to contain that much solute - remember that the higher the temperature, the more "room" there is. The solution is now supersatured. It is unstable and wants to release some of the solute as a solid, as it doesn't have enough "room" for it. However it is unable to do this if you simply leave it standing there on the table.
      By dropping in a seed crystal, the doctor has just given that solution the opportunity to release the excess solvent as a solid - thus the solute rapidly leaves the solution and becomes a solid (a crystal).
      Please take this with a pinch of salt, I'm a sixth former doing some background research on the topic, not a professor. I've also simplified some aspects. Correct me if I'm wrong guys.
      Tl;dr - water has too much stuff dissolved in it, by dropping in a small object you allow the water to release all the excess dissolved stuff in the form of a crystal.

    • @josueemmanuel2570
      @josueemmanuel2570 9 років тому +1

      FarmerMildred That answer was excellent to me. Thank you and God Bless. :-)

    • @shaikhzoya2002
      @shaikhzoya2002 9 років тому +2

      FarmerMildred How crystal seed allow the water to release all the excess dissolved stuff in the form of a crystal?

    • @luckyshots3094
      @luckyshots3094 9 років тому +2

      shaikh zoya Essentially, crystallization helps the solutes dissolved in their to achieve a lower energy state. The crystal seed that is added has to be the same solute dissolved in the solution, and provides a nuclei for the other solutes to crystallize upon. It basically provides the activation energy necessary to start the process of crystallization.

    • @KevinknPham
      @KevinknPham 9 років тому +3

      You don't even need a seed. You can even activate it with a scratch on the beaker in some cases.

  • @Isis-wm4po
    @Isis-wm4po 13 років тому

    @Isis4211 Nevermind, I didn't read it in the description. Sodium acetate, right?

  • @varshabodepudi4942
    @varshabodepudi4942 4 роки тому +1

    their reactions are so cute ^^

  • @strawberryskittle100
    @strawberryskittle100 12 років тому

    Can you do that with a sugar solution?

  • @joebales9498
    @joebales9498 2 місяці тому

    Wow! Mole Howard would be proud.

  • @xeption2406
    @xeption2406 3 роки тому

    POV: You were recommended this in the year 2022. I'm here because I genuinely don't know what a supersaturated solution looks like.

  • @DarthKraytofKansas
    @DarthKraytofKansas 11 років тому

    As opposed to...?

  • @TTortrix
    @TTortrix 12 років тому

    This video became a lot more interesting when I saw the touchstone rope series shirt.

  • @badtoroplaysstuff101
    @badtoroplaysstuff101 Рік тому

    Amazing video bro

  • @kodiak9840
    @kodiak9840 Рік тому

    I'm really glad these students merely hovered at demanding and disrespectful tones rather than just beating the shit out of their teacher for demonstrating anything at all.
    Then again...these students placed the arrow sign leading the rest into the land of chaos and uselessness.

  • @internetdinosaur8810
    @internetdinosaur8810 3 роки тому

    I have no intention of being a chemist, but god damn do some (not all. fuck those lifeless teachers) deserve all the love in the world.

  • @danielcruz1832
    @danielcruz1832 10 років тому

    could you do this with table salt?

    • @davidrussell6762
      @davidrussell6762 9 років тому

      Daniel Cruz This will not work with table salt because the solubility of sodium chloride does not change with temperature. In order for this process to work, you need a solid that has increased solubility at higher temps. Create a saturated solution at a high temperature, which will contain more dissolved solid than what is permissible at lower temps. Let the solution cool to room temperature and it becomes supersaturated. Adding the "seed" crystal causes all the excess solute to come out of solution.

    • @gregarityNow
      @gregarityNow 9 років тому

      David Russell Actually NaCl does become slightly more soluble as temperature increases. See this graphic: chemwiki.ucdavis.edu/@api/deki/files/41042/solcurve1.gif?size=bestfit&width=384&height=290&revision=1

    • @davidrussell6762
      @davidrussell6762 9 років тому +1

      Point taken, but the difference in solubility over that range of temperatures does not allow for such a significant degree of supersaturation as other salts like sodium acetate or sodium nitrate or potassium bromide.

    • @toniarner7791
      @toniarner7791 9 років тому

      +David Russell HOw long do you have to wait before adding the one crystal? Can you just wait a couple hours for it to cool?

    • @lesgoddam1949
      @lesgoddam1949 8 років тому

      Just needs to be cooled down sufficiently. Doesn't matter about time.

  • @sumitjaiswal3973
    @sumitjaiswal3973 5 років тому

    Sir how it make

  • @Isis-wm4po
    @Isis-wm4po 13 років тому

    What kind of salt was used?

  • @mtdeezy
    @mtdeezy 12 років тому +1

    What language are you speaking?

  • @thekingalejo97
    @thekingalejo97 12 років тому

    this experiment as I need help is a job within 4 days and no e STARTING help with the materials and steps
    Please

  • @alieser7770
    @alieser7770 5 років тому

    What salt is that?

  • @523101997
    @523101997 10 років тому

    His water is so clear, mine ended up being cloudy as -.- haven't put the salt in yet, still in the fridge

    • @thecanadianshadow1176
      @thecanadianshadow1176 10 років тому

      dont put in fridge (just a tip)

    • @Rueyful
      @Rueyful 10 років тому

      That's because you have impurities, you created a colloidal solution, with salt crystallized around the impurities.

  • @LegendsDiary704
    @LegendsDiary704 3 роки тому

    Wow what amazing scene

  • @raydogloc8127
    @raydogloc8127 7 років тому

    Can we all have a little piece. NO I HAVE TO SELL IT!

  • @NeoAxiom
    @NeoAxiom 9 років тому +12

    I'm making an MLG montage out of this.

  • @spotlightman1234
    @spotlightman1234 12 років тому

    Jesse in walter white's old chemistry class, the early years.

  • @jdsphantoms
    @jdsphantoms 12 років тому

    that was cool but the oooooooooooooooooooo was priceless :)

  • @nathanielraeymarquez2102
    @nathanielraeymarquez2102 6 років тому

    All of my classmates are overlyexcited

  • @fragilebean1314
    @fragilebean1314 9 років тому +3

    That kid in the blue hoodie is cute whoops

  • @happycoupleLA
    @happycoupleLA 12 років тому

    Annoying? Most teachers would LOVE to get their students this enthusiastic!

  • @hieutrong461
    @hieutrong461 7 років тому

    What 's that?

  • @timothytardis8754
    @timothytardis8754 11 років тому

    How do you make that

    • @DragMeh9100
      @DragMeh9100 10 років тому

      Dissolve as much sugar (or salt) as you can in some water.
      Heat the water.
      Add more sugar/salt
      Put the concoction into the freezer.
      And add sugar/salt!

  • @amaviweerakoon4998
    @amaviweerakoon4998 10 років тому

    It looks like a... Like a... PUFFBALL!!

  • @KTandLZ
    @KTandLZ 12 років тому

    Technically just bumping it could have triggered the reaction as well

  • @yamunayamuna8267
    @yamunayamuna8267 8 років тому +2

    Thank u for this amazing knowledge video

  • @315polp
    @315polp 4 роки тому +6

    Came here because of Jordan Peterson’s 12 rules

  • @shawniscoolerthanyou
    @shawniscoolerthanyou 9 років тому +2

    0:44 you're welcome.

  • @Drie237
    @Drie237 5 років тому

    Amazing video!

  • @eekmeep
    @eekmeep 4 роки тому +1

    Man this is cool!

  • @marijanmarelja7817
    @marijanmarelja7817 3 роки тому

    The teacher looks like Heisenberg lmao

  • @bhavyagupta4346
    @bhavyagupta4346 7 років тому

    Amazing video.

  • @ccczeppelin926
    @ccczeppelin926 11 років тому

    Not all of them.

  • @mrkrabs622
    @mrkrabs622 3 роки тому

    Jordan Peterson's Miss S story (also mentioned in the video) brought me here.

  • @anotherhuman
    @anotherhuman 12 років тому

    I thought they were charming. awesome video! great experiment. This rapid crystallization is just like what's happening with CONSCIOUSNESS now on this planet. For millennia, we've been becoming more and more super-saturated, with knowledge, understanding, spirit. Now, we're just like that glass of liquid before the crystal was dropped in. One little thing can happen that can change everything. People, welcome to the Great Turning. Peace Love and Blessings!

  • @SuperSpable
    @SuperSpable 11 років тому +6

    Nice video. The teacher didn't do a good job of explaining what a supersaturated solution is, though.

    • @48956l
      @48956l 4 роки тому +2

      SuperSpable and yet this guy is better than the average public school teacher here in the US. Our school system is preeeetttyy bad

    • @Dr.AutismGod
      @Dr.AutismGod 4 роки тому

      @@48956l Pretty sure he is American :/

    • @48956l
      @48956l 4 роки тому

      @@Dr.AutismGod My comment doesn't exclude that as a possibility.

  • @TheNickBellich
    @TheNickBellich 12 років тому

    So... Beautiful

  • @iloveme30ify
    @iloveme30ify 12 років тому

    Touch it touch it

  • @TheDeadsilent
    @TheDeadsilent 11 років тому

    Hasty Generalizations= Annoying

  • @mskittykat1101
    @mskittykat1101 12 років тому

    probably sodium acetate

  • @ibensince2
    @ibensince2 11 років тому +3

    It takes 30minutes to cool it not a year

  • @Psycho0124
    @Psycho0124 12 років тому

    Sodium acetate is the solution. He dropped in a crystal of sodium acetate to act as a seed crystal.

  • @abbycastino792
    @abbycastino792 4 роки тому +1

    hi mrs.maness kids if you see this

  • @Return_To_Sender
    @Return_To_Sender 12 років тому

    It's actually just all highschool kids....

  • @viniciusdeoliveiraaguado5987
    @viniciusdeoliveiraaguado5987 6 років тому +8

    thanks Jordan Peterson...

  • @JuanmaWeed
    @JuanmaWeed 12 років тому

    Walter White teaching some technics.

  • @jacksonbaker468
    @jacksonbaker468 6 років тому

    cant hear a blumin thing, but good video.

  • @rodrocket712
    @rodrocket712 11 років тому

    Exothermic reaction me thinks

  • @Zander101084
    @Zander101084 12 років тому

    I'm sure he/she was talking about the students, not you