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From: doesthisfuckingexist
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  • Test slits under water u get 2 beams from the laser.

  • this happens because the act of observing changes everything.

  • It's like Keanu Reeves hosting a science show.

  • @senseofnickels keanu reeves learning from long duck dong....dong asks him a question, and follows with "that's weird, right?"

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  • Hey guy in the blue shirt, please get back to changing my oil. I really have to get going.

  • even i know what a photon is.

  • what an interesting topic. What a dumbass host

  • I thought that the reason for the pattern not just being two lines was interference of the waves, so that they either cancel each other or double in effect, depending on where the troughs and crests meet? I understand the principle that a particle can be in two places at once however I didn't think that this was the explanation for the pattern and was rather the explanation for explaining which slit the photon went through, although not measurable?

  • meh. the only reason this is confusing for people is BECAUSE the put into terms of bloody tennis balls.

    Put into the actual scale (incomprehensibly small), and considering that photons have no mass - not so much. Kind of goes into a different category

  • Is the guy in blue mentally challenged? If not, he should just be fired, he is annoying and unenigmatic to watch

  • @crosbying That is Hugh Everett's son Mark Oliver. Hugh was a brilliant theoretical physicist and founder of the multiverse theory. His son is a very successful musician who never knew what his father did for a living. He walked in the living room and found him dead from a heart attack as a child. This was part of a documentary where he travelled the country meeting with physicist to discover more about his father.

    P.S. You are a fucktard.

  • @Strawhat78 I see, given the lack of information in the video, I assumed it was the kind of uninformed hosts that we see all too often in these kinds of shows(I watched a bunch here), I am familiar with Everetts Many Worlds Theory. Still I dont think his son is very interesting here, but the premise is. Thanks for informing me

  • @Strawhat78 That is a nice sob story, but he still presents himself less than or equal to a urinal cake.

  • @Strawhat78 I knew this clip was familiar. Thanks for refreshing my memory.

  • @crosbying No its just not his scene ( he is not interested ) - he is into music, he doesn't know much about his fathers work

  • @austpom333 Ye I was told, I actually knew some of his music, its just that watching the video it seemed an odd choice for a host, and the description dont explain that its about him learning his fathers work, which gives it more sense. If it wasnt like that, chosing someone like this would be a bad choice from the production company.

  • what are the implications of this?

  • @djangoprodegy

    In the words of Nobel prize winner Richard Feynman everything there is to know about quantum mechanics is contained with the double slit experiment. What is shown here is very simplified. Diffraction, the mechanism causing the interference pattern, also occurs with matter such as electrons and protons. This demonstrates the partical/wave duality of nature. There is also a temporal effect which defy the concept of causality. The more you know about it the more amazing it is.

  • For anyone, a photon is a discrete packet of electromagnetic radiation.( known as light ) its energy is given by frequency and plancks constant. (approx 6.63*10^-34 Js)

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  • How can they see the photons? Aren't they invisible even to microscopes? Also, how can you create a machine that fires only photons?

  • @smokenfly514 Photons are light particles... You see billions of them all the time when you use your vision. And so if you use a flashlight, you're firing only photons wherever you point the light.

  • @JOBoarder27 thanks a lot

  • @smokenfly514 A photon is the smallest unit of light... so yes u can see it if u have a camera sensitive enough.

  • @jamesarongray aren't they as small as atoms though? and aren't atoms technically invisible?

  • @smokenfly514 their size doesn't matter, it is light and we can detect light on photographic film. An atom is not light therefore u can't see it.

  • @jamesarongray interesting, thanks a lot

  • QUANTUM PHYSICS IS FUN

  • add on for young's double slit experiment like you've never seen before

    watch?v=Z_6XqRHrp7U

  • @xjoe1988x hahahaha

  • double slit experiment all the way!

    what does it mean!?

  • @fatalistjohannes

    EVERYTHING is a wave of possibility until we observe it.

    What does this mean?

    The fuck do I know.

  • WAIT WAIT WAIT WAIT LOLOLOLOLOL?????? did they just prove the double slit experiment wrong? they were observing it (and measuring it) yet they still made a interference pattern???????? arent they supposed to make 2 lines? OH maybe thats quantum particles only. my b

  • @SARGAMESH think you need some more lessons mate, you dont have a clue

  • It still made 3 smudges, even though the photons were observed? Hmm.

  • @Th3Xp3rt yes because they wernt measuring the photons or trying to see exactly witch it went though, if they did try and observe with it went through,that woulds destroy the wave interference pattern causing the photons to only act like particals, creating two "smudges" they were just watchign what happens when you shine the lazer at both slits so thats why it didnt destroy the pattern

  • @Th3Xp3rt Where they landed was observed, what forces them to act as a particle and make 2 lines is when we observe which slit they go through. Once we do that, then it behaves like a basic particle and makes 2 lines. Observing which slit it goes through destroys the interference pattern.

  • Now open the box and let us see the collapse!

  • I don't get why this isn't explained by the wave nature of light? I also feel like the theory is presented with a situation it can't explain and then goes on to conclude how it must be happening, without having good evidence for that process, just how it could happen. But its interesting.

  • @derdudernan IT IS explained by the wave nature of light, but this experiment shows that light acts like matter and waves, read some more about it man, will explain your questions, they have an idea of how its happening based on quantum laws but they still dont totally understand that

  • What happens when:

    1. the gun shoots through left slit for, let's say 5minutes.

    2. the same gun from the same position, shoots through the right slit for another 5minutes.

    What pattern will be created?

  • @pierros14 The gun shoots what? "normal" matter, or elementary particles like photons or electrons? thas the big issue here.

  • How can the technician dont know what a photon is ???? WTF !!!!

  • @Sano22n he does, he jsut cant explain it really in a way that guy would understand

  • @Baaaarny1 ......i dont think so..... just look at his face when he is being asked what a photon is..... lol ur a technician, youve done all your life these experiments and yet u dont know wat a photon is ????!!!!!!!!! WTF !!!!

  • @Sano22n are you serious? he knows what a photon is, but it's still hard to explain - and think that english is not his mother language. Photons are particles that do not act as particles, while at the same time they do. try explaining that in layman's terms when you've been working with people around the clock, who talk in quantum physicist's terms. Ask an artists what the key to a good painting is, he wouldn't know where to begin.

  • My theory is Black holes are made of chocolate and cosmos are made of ghost particles! If im wrong prove it! You cant because this is real science! Yeah right more like science fiction! all scientist do is try to make their lies(theories) true! Lame!

  • ?+ observer effect=Quantum Physics? God! Without him in the formula you can never truly understand Quantum Theory or anything for that matter! Science + a Lie= Atheism! example: theory's are a made up lie till proven True!

  • @ladylaw89 Liars + fairy tales + money + hate + more money + nonsense + no evidence + more money + more fairy tales + mentally blind people + power - (logic+evidence)³ - (nature laws)⁴ = Religion

  • Observer effect? what about a blind person or a death person! is their no sound or walls when your not around? can a blind man walk through walls? can he walk on air or water? is a retarded person normal when were not around! I think not because God is the ultimate observer! and if hes not looking you dont exist!! Stupid atheist scientist! The way true knowledge works is you wont know unless god

  • @ladylaw89 A blind person continues to exist even if he doesn't see. People and everything else continues to exist when you aren't around. This is true because conscious awareness of the beings ensure that they exist. Photons have no consciousness and behave erratically until the conscious awareness of another being is applied to their existence. The photon then behaves as logic would dictate. Prove that science is a lie. Prove that god exists. I dare you.

  • @EliR58 that is just jumping to conclussions, we are not even sure how it works, i dont say theres no god but from this we cannot assume god exists we havce to be 100% sure how it works then we can say its beyond anything and attribute it to god according to what we know of god according to religion and dogmas at least

    and no science is not a lie, neitehr a truth ,it is just a tool for us humans to understand things ,if its mistaken its just part of it but it doesnt claim anything without proof

  • @ladylaw89 You probably totally misunderstood what a quantum measurement is (if you did even try to learn about it). To measure doesn't necessarily mean to see. It doesn't even have too much sense to talk about that in macroscopic world, but, you could be "measuring" by touching, hearing, not just seeing. God observer? WTF? The human body has lots of defects,so,no god created us (i.e. god doesn't exist) or your god is a great idiot who doesn't know anything about human design. PIck one.

  • Mark Oliver Everett ( E of Eels ) for the win :)

  • I'm shure there is a simple explanation for this. Since photons have no mass they can't be particles and are just waves.

  • Totally off topic: The girl's voice is SO HOT

  • @GregHM81 maybe becaus u think with your dick ? lol

  • @msms47 Fortunately no, I have a brain for the thinking part. I only use my dick for fucking and peeing.

  • sorry off topic but their is no common sense what is common to me may not be common to you or him or her

  • it has the potential to be one or the other...the wave function collapses during the observation and the particle (wave particle) acts as a wave. If you cover one of the slits or if you, for example intorduce a flashing light over one of the slits, it will produce the 2 vertical stripes as it goes back to behaving like a particle. energy has the potential to be one or the other..probability.

  • Could somebody please explain me this: How can we produce a single photon? The technician could not explain what a photon was, but still, he has a machine that can can produce one...

  • @mipejaatyt001

    The are being produces constantly by the sun. the photons (packets of energy) that hit your retina, have been shot out of the sun, travel through space and land in your eye 8 minutes later= you are seeing the sun 8 minutes old. Or from distant galaxies sometimes thousands of years later= the galaxy is already gone and dead, you see it as it was thousands of years ago. Space is a time machine. Photons are quanta of energy with a positive charge.

  • @mipejaatyt001 /watch?v=JIGI-eXK0tg

    Mathematically, the photon is mostly understood. Conceptually, it basically cannot be imagined its so crazy.

    In terms of how we can actually 'produce' a single photon, remember a photon is just a single bit of whatever light actually is, and we know how large they are, so you just use a laser of that size so only one comes out at a time.

  • Could one define a photon as a quanta?

  • @bmwm3cs Yeah, because quanta are particles that have quantum physics applied to them..?

  • a photon is a particle of light and light is a wave vibration . like a ripple in still water

  • Wait so its the laser moving during this experiment? What if the laser is just pointed between the two slits? it wont go through.

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  • My questions is, if they shoot photons via the same source but without any slits... what would the pattern look like? Would it be a single point on the film or a single collection (smudge) on the center of the film? Seems to me photons may not travel in a straight line, rather they travel erratically but prefer to land closer to where they were aimed. Im sure there is a formula for this. Something about being in two places at once doesnt seem right but would be a convienient explaination

  • @ricktbdgc from what I understand there won't be any interference thus no pattern. the same would happen with only one slit.

    it seems that photons are particles that can travel like waves if they have to. which can mean only one thing. - we don't know what a photon is.

  • This is probably the worst explanation of this experiment ever.. and this was on the bbc?

  • @CmanCorporations People watching tv aren't really gonna be looking for a complicated explaination of quantum physics, they just want to be impressed. :L

  • @Scwirul umm, do you think anyone was impressed or remotely interested by this explanation? Search up Dr. Quantum Double slit experiment. Now that is a simple, exciting, and impressive presentation. They should have just showed that on the BBC.

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  • hey, fuck your eyesight, you got to see your the who !

  • What is the name of the background song/music ?

  • @ankitkhare The music on 3:11 is from Pink Floyd's "The Wall" album.

  • If the laser is pointing in between the slits then how would it go through either? Or was it positioned differently?

  • Yeah this really was not that well explained, they missed one of the main points of the Experiment, of the strangest results of the this experiment was that when Physicists tried to measure or "Observe" which slit the "matter" goes through it reverts to only hitting the to spots where the slits are. the simple fact that Observation, human or otherwise is present the particles act differently. without this point the expirement loses some of its wow factor.

  • @devileye669

    Yes but the act of measuring, or detecting, a particle will disturb its normal function and thus temper with the result of the experiment. There is no way to detect or measure a particle without mechanically interfering with it in one way or the other.

    So while its facinating, the dual characeristics of particles is not at all mystical or unexplained.

  • The host marc is so lifeless and kinda retarded !

  • why did the video not mention anything about the photons acting differently when they are measured as in this vid /watch?v=DfPeprQ7oGc

  • Even if everything has both wave- and particle like properties. Explain the change in behavior when being observed. This video doesn't mention it but when observing the path of the photons, the pattern goes back to 2 stripes.

  • I don't know if I can wrap my head around scientific terms like 'a hell of a quantum state'.

  • I have seen this experiment done with my very own eyes, except instead of two slits, a crystal is used, which can be modeled as many slits, and instead of photons, electrons were used. IMO the experiment when done with electrons is even more beautiful.

  • Something about "in 2 places at once" doesn't make sense to me. My poor ape brain just doesn't seem to want to comprehend it

  • @spartacandream

    It shouldn't make sense, the result of this experiment is extremely non-intuitive. However, it may be easier to think of the photons, not as being in two places at once, but actually have two natures at once. One nature is that of a single particle in a single position, and the other nature being that of a wave, spread out over a range of positions. The experiment just goes to show that all particles have a wave-like nature.

  • what if theres more than 2 slits ?

  • why is the only explanation for it to be going both the slits at the same time? and not for it to be moving like a wave and only going through one slit?

  • you couldn't pick a worse guy to explain this experiment. ghastly.

  • so how do you observe it? getting 2 slits?

  • And that, ladies and gentlemen, is quantum superposition.

  • Thank you for posting this! I would love to see more from the little guy teaching the class! He intrested me very much!

  • A good question would be "What factors determine which atom on the board takes in the energy of the particular wave" probably the one that matches most precisely the amount of energy of that wave. Another question "When an atom on the board does take in the energy of the photon wave, to what extent (distance from the receiving atom) does the wave collapse, probably again the same amount of energy that is received by the individual atom.

  • How can a photon be an object. An atom is an object as it is energy in a stable and probably spherical shape, giving it a volume and mass, hence it can be an object. I fail to see that a photon can be an object if it is just a potential wave.

  • i makes me laugh how this is a poor demonstration. I actually am in grade 11 and me and my friend tried this experiment. what you need? sticky pad, 3 pencil leads and a good laser, can also be a pen one, but the small hand one in labs give a better representation. take the 3 leads and stick them close together(2 slits) shine the laser throw it, adjust the space between, and its unbelievable the results. From a long distance, you can see the waves within the squares of light on the wall.

  • Does anyone know if it's true that when you observed which slit the photon passes through the results change to show only two lines of impact on the monitor?

    Or is this just b.s made up for movies like What The Bleep?

  • WTF! he can't answer whats photon?! IT basic physics! Photons are what Light is made of!!

  • @LookMaNoBrains haha. its soo so so much more then that.

  • @LookMaNoBrains yeah, if you are 10 years old and just learning science. Photonics is so far beyond your simple description it's laughable

  • Cool video to see the actual tools used when conducting this experiment, with real time observation. Dr. Quantum's video is much better for actual understanding though. This video does not even mention that the photon stream acts as a wave. The video almost makes it seem as if the interference pattern caused on the back-screen was caused by some sort of trajectory-modification caused when the photons split. This is not correct.(As far as I've learned. Of course I could be completely wrong! Hah!)

  • Why can't we argue that the "particle" electron bounced off on the inside of the slit(after all the slit must have a thickness to it much more than the photon/electron). Could that electron not have ricocheted from that area of the slit?

  • Dr.Quantum does a better job!

  • Question: There were three smudges. If the photon gun was equidistant from both slits (in the center), then if a photon was to bounce off of the far wall of one slit, it would land in the same (center) location as it would if it bounced off the far wall of the other slit. That would show the three distinct possible places that photons could land, going through each slit, or ricocheting off the far wall of each slit... how does this prove a wave nature?

  • @sleepyeyeguy What do you mean by "bounce off the far wall of one slit"?

  • @sleepyeyeguy I am not a physicist and really know very little about this, but if I'm not mistaken when this experiment is conducted the result is usually many bands (rather than three) which reflect the interference pattern one would expect to see when two waves collide.

  • why there are 3 places since there is an observer ?????

    isn't suppose the observer to make the particles behave as particles ???

    and how the photon considered as particle since it is mass less???

  • @gaithouri From my very very basic understanding, they are using the film as the detector, not as the observer. If they used a second camera filming the photons as they were going through the slits they would act as particles.

    This is so weird lol.

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  • @Scwirul They both have glasses......

  • @Dekulink333 Maybe I should have thought my comment through :L

  • They left out the most important part. How when you observe it with a camera, the light sets up a pattern of two bars instead of 3. The simple act of observing changes the outcome.

  • Couldnt they just be bouncing off the inner wall of the slits?

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  • Why would the photon split before going through two slits but not split before going through one?

  • it seems nobody has mention the obvious variable of ricashae

  • consciousness affect absent.

  • What happens if the two slits are very far apart, as for example, one in the US and one in Russia? What pattern is generated then? Or suppose the sensing screen is move up toward the slits, as for example, suppose it is only .00001 mm from the slits?

  • The scientist looks like a really cool person.

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  • Urm a simple question, but has this test been done using different elements for the slits?

    Just to see if electron patterns remain stable?

  • @MrInfadel

    "Urm a simple question, but has this test been done using different elements for the slits?"

    YES!

  • At the end, she neglected to mention the part where the photon is getting interference from ITSELF before landing on the wall...

  • It's a wave.

  • Observation stops the interference pattern. Is this an argument for a kind of neo-idealism (philosophical sense)? So nothing exists until it's observed? Nothing existed before a perceiving consciousness existed? Not the dinosaurs, big bang, nothing? Shhh! don't tell the Christians, they might be able to use this!!!! I'm I going overboard?

  • @Psychogenius018 Couldn't the particle simply be bouncing off the inside wall of the slits?

  • @aarontassin thats what I thought. I want to see the double slit experiment done with a little more consideration of the variables.

  • @aarontassin Yup could be boucning off the inside of walls , or could be bouncing off each other to make that pattern, so they shot the particles one by one just to verify , and same results . lol .

  • @Psychogenius018

    It's actually the opposite. According to Quantum mechanics, EVERYTHING exists, until it's observed.

    That's why the single photon can go through both slits at the same time, since there's no observer.

  • @LastEmperor28 So all "possibilities" exist as actualities in "superposition" and consciousness filters and limits "possiblities", or the realm of actualities, down to one or the other? So it would it be more accurate to say that all "possibilities" exists as actualities simultaneously but consciousness can only observe one "cause and effect chain" of actuality? So both are true..."free will" and "determinism"? AHHHHHHH!!!!!!!!

  • @LastEmperor28 Whats that to say about god ? If we were to observe him? lol. This quantum mechanics flips everything upside down. everything we thought we knew is stopped by this observation problem. Its beautiful and elegant in a way , yet very scary and exciting lol so many emotions in one its just wow . goosebumps

  • @yourboycal any ideas as to why we are making a differentiation between the observation of the pattern on the back wall, and "recording device's" observation. If observation changed the action, then why will it "let us" observe the action on the back wall, but not before it goes through. It makes no sense, so I don't think that "observation" is the problem. It must be the method of observation, not he observation itself. Thoughts?

  • @JustusScottJr Yea i agree with you buddy its the method of observation if not then were into some twilight shit hehe . For nature to change its method simply because there is an observer brings everything back to a reality check . Reality is far more shakier then we realize now . IM sure with time and few more experiments we will find a rational explaination for the irrational behavoir , if not then i think were in the first few pages of the blue prints to the universe

  • @yourboycal yeah I just watched another video by "mindhush" called "Explained ! The Double Slit Experiment" and he says that they could leave the detector on, but not record the data they detected, and it would be a wave pattern, but record, and you get the particle. I agree with you. There has to be another explanation that we are just not advanced enough to think of. The other alternative is sentient electrons.... yeah, I'm thinking no.

  • @LastEmperor28 What I can't wrap my mind around is how "observation" affects the outcome of an action. It doesn't make sense, so I doubt it is what is really happening. By looking at the pattern at the back wall, we also "observe" the results, with no "effect" to the outcome. What does make sense to me is that the recording device's actions are interfering with the photons actions. I'm not a scientist, so maybe I am missing something. Any thoughts?

  • @Psychogenius018

    Observation doesn't stop the pattern. Bombarding the photons with other sub-atomic particles (like electrons or other photons) mid-flight does.

  • Actually photon is produced when electron is excited or heated up. We know that photon has a frequency therefore it is definitely a wave. Photon and electron are of 2 different things, but once photon is measured by an instrument that changes its characteristics it collapses its wave function. I don't think it splits up when passing through the 2 slits. Imagination sometimes is believable but i don't..

  • a simple anwer is ...

    a photon is the particle of light ...

    but then theres the questuon of waves? isnt light made of waves? well yes it is ...

    its both ...particles and waves ...

    light is waves when it moves throo space if it doesnt interact with anything , but when it interacts with something ..its like 1 singular point ..

    and this applies to all objects ..even the basketballs behave as waves ...but their wavelength is so small they "almost" always land in the same place..

  • "photon" is a made up word to name what we have no idea what really is....Actually there is no such a thing like "photon"...(he should answer that a photon is a quanta of light...)

  • single slit rotating and 2 single slits merging

    watch?v=vwlp9nwMueM

  • where's the rest of the video that shows them measuring which slit it goes thru and collapsing the wave function of the partical so that it acts as a photon again??

  • i have an idea ...a hypothesis ...its prett crazy but hear me out

    we know that fundamental particles are always dissapearing and reappearing ...

    in fact they appear BEFORE they dissapear ..cus they can exist in more places at once ...

    would this imply that on small plank lenght distances ...the particles are travelling faster than light?? and thus travelling throo time?

    think about it

    a particle is just standing there ..then appears somewhere else ..is in 2 places at once ..then dissapears

  • its like the particle ..goes in the past ...meets itself ..then the first one dissapears ..to where it appeared ...

    its basicly appearing somewhere BEFORE it ever left ....

    im always thinking about this ...

  • I think they just move to fast to be observed in the first place by any means, cause it has been "observed" that these "particles/waves" cannot have their velocity and location measured simultaneously.

  • ur forgetting mathematics is more important here than actual observing ... every particle the standard model predicted to exist was found ... every single one

    the higgs boson and the graviton are from different theories ...so they arent part of the original standard model ..there is a chance they might not exist ..but they might exist ...

  • Haha, perhaps, what are the mathematics here?

  • LOL a Quantum Physics professor got stumped by the the question "what is a photon?" How cute

  • well its not exactly an easy question ..

    i mean ..a photon has no electric charge, it has no color charge, no strong charge no weak charge, no mass, and moves at light speed ..

    its almost .....nothing at all :)

  • @sidewaysfcs0718 photons have mass

  • no they dont ...they tehnically would have a mass equivalence since they have energy but photons have no rest mass.

    even if e=mc*2 that doesnt mean particle with energy need to have mass ....the reason they dont have mass even tho they have energy is that they dont interact with the higgs field.

    and even if the higgs field is theoretical and was never observed its the best explanation that works mathematicly

    and thats why the LHC was built ...

  • photons do not have any mass at all (zero), but they do have momentum.

    according to newton this is impossible because in order to have a momentum you have to have mass, but a modern formula corrects this mistake and says it is possible.

  • photons have kinetic energy wich can increase the mass of something that absorbs them , and common sense would tell you they have mass

    but they dont have individual rest mass ...they can create mass by their kinetic energy but they dont have individual mass ....

    thats quantum mechanics for ya.

  • @sidewaysfcs0718 tnx for the explanation, it's really helpful , now i know..

  • I believe in what Einstein said "God doesn't play dice". Everything can be predicted, including what a person is going to do next and what an atom is going to do next, if you understand how things work, and if you have the equipment to do whatever it is you have to do... This double slit experiment will make sence one day, when a genius figures out whats what

  • at the quantum level nothing is predictable ...einstein said " i cant believe god plays dice" after he heard about the un certainty principle.

    althow the uncertainty of the quantum level ..does not affect the determinism of the large scale level.

    so we could predict everything at the large scale ...but at the quantum level its pretty wierd ...

  • and whats more wierd is that photon actually does all theese at the same time:

    it goes throo both slits at once

    it goes throo neither

    it goes throo only 1

    it goes throo only the other

    ALL at once.

  • throo?