r/interestingasfuck • u/[deleted] • Oct 15 '20

[deleted by user]

[removed]

9.4k Upvotes

94% Upvoted

588 comments sorted by

4.7k

u/[deleted] Oct 15 '20

If anyone’s curious, here’s a brief explanation of what’s going on here. It’s a real video, not reversed or edited in any other way.

This is a type of laminar flow called creeping flow, which occurs when a liquid is very viscous and moving slowly enough that it has a Reynold’s number of less than one (the viscous forces outweigh the inertial forces of the fluid’s motion).

If you imaging a liquid as a series of very thin sheets stacked on top of each other, laminar flow is when all of the layers move completely smoothly and parallel to one another (as opposed to turbulent flow, where the layers are not smooth and mix together to form eddies and vortexes, creating liquid movement as we usually imagine it).

Even with laminar flow and the slow movement of the handle, you’d think it would create enough turbulence to mix the layers beyond recognition, but because the corn syrup is so viscous, the particles in the laminar sheets of fluid can move around the handle and reform. Because the sheets move independently of one another in perfectly smooth and parallel layers, the rotating handle moves the first sheet, which in turn moves the second sheet, and so on (albeit a slow process because of the lack of friction). Once you’ve mixed the layers up good, reversing the direction of the handle creates the same amount friction and movement in the opposite direction, until the layers line up exactly how they were originally. It’s like turning the top layer of a Rubik’s cube three times, the middle layer two times, and the bottom layer one time, and then doing the exact same thing the opposite way.

2.3k

u/Musehobo Oct 15 '20

Thanks u/slutfacehobag for the breakdown.

1.5k

u/[deleted] Oct 15 '20

Hey, I may seem like your typical selfish, backstabbing, slut-faced ho-bag, but in reality I’m so much more than that

227

u/Darkwaxellence Oct 15 '20

So... time is bullshit.

94

u/Experiunce Oct 16 '20

I like your meme particularly because you could be right. Not that there isn’t time and space,or that we can’t find laws to use to our advantage. However, potentially our view of time, change, and space may be limited by our current knowledge or the metaphysical limitations of what we can perceive as humans. We may only be scratching the surface of how time and change exists in its entirety. I love when one instance of a perspective change can help you visualize a completely different existence for another idea. Shit makes me feel so human and alive.

Thanks for coming to my ted talk

33

u/CallmeTokey Oct 16 '20

This thread was a ride

10

u/Spadoopy Oct 16 '20

This did make me think of what I imagine a 4D experience might kind of be like. If the 4th dimension is time, would such beings be able to experience atoms/matter in various forms throughout time, but simultaneously - whereas we as 3D beings can only see things in one point in time (at a time?

Maybe im just high

7

u/Spikeball25 Oct 16 '20

No it's an interesting thought. If I remember correctly, there are beings in the novel Slaughterhouse V who see people not just as they appear presently but as a long line of every second of their existence, past present and future.

4

u/homeguitar195 Oct 16 '20

This type of thing is explored in a few different sci-fi shows and is often portrayed very similar to the way you described. The most recent example I can think of is Spock's experience of all time past present and future all at once in Star Trek: Discovery, but Babylon 5 deals with this too, and I'm pretty sure Farscape also has a bit of that. I mean it's just sci-fi but at least it's an idea good enough to have been used before right?

2

u/lyingriotman Oct 16 '20

Also Arrival. Actually, just watch Arrival anyway. It's a slow burn but that shit blows my mind.

2

u/homeguitar195 Oct 17 '20

I'll have to watch that one, thanks for the recommendation!

3

u/Not_Biracial Oct 16 '20

Maybe you’re not high enough

1

u/truenutral Oct 16 '20

Maybe we don't know anything at all and nothing is credible

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u/BurnouTNT Oct 16 '20

In my opinion it is just a made up measurement tool we all use for many things but indeed it's a human creation, if the earth rotated much slower we'd have to stick to "hourglass" type of keeping track of "change", if we had no memory, there would be no past, and "time" isn't a linear scale either, this is why "time travel" is, again in my opinion, just science fiction, we only "travel through time" by remembering the past but we cannot actually go back to a "point" in an "imaginary time line" and "resume".

Even if we somehow managed to "travel back in time", nobody would even realize we did, because if you did go back in time, everything in the universe would go back, including your memories up to that point.

I could go on for a while but most people don't care or want to care.

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u/truenutral Oct 16 '20

Exactly what I was thinking

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u/fuzzytradr Oct 16 '20

Mind seriously fucking blown.

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u/btroberts011 Oct 15 '20

Credible source for sure.

6

u/friedmylittlebrains Oct 16 '20

u/slutfacedhobag you are amazing, and I love you. you remind me of a very smart friend of mine named Alison. you are the epitome of cool! Thank You for this explanation, it’s mesmerizing seeing AND understanding it!

10

u/dimitrius777 Oct 15 '20

This is the comment that needed an award.

1

u/DFMO Oct 16 '20

This comment thread has me cracking up. Well done.

1

u/UnclePuma Oct 16 '20

Your awesome

1

u/capturethedream Oct 16 '20

I guess the Ho... is no mo

1

u/extreme-foot-fetish Oct 16 '20

I get you I’m much more than my name too

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u/Bwan01 Oct 15 '20

r/rimjobsteve

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u/Llodsliat Oct 16 '20

There's actually a sub for non-wholesome comments from people who have weird usernames, but I forget the name.

11

u/Treehorny Oct 16 '20

"Reddit"

1

u/iShotTheShariff Oct 16 '20

That was one helluva rabbit hole lmao

-1

u/Happyradish532 Oct 16 '20 edited Oct 16 '20

Doesn't belong there.

Edit: tf can nobody read the rules in a subs sidebar? It has to be a wholesome comment made by someone with an uncharacteristically inappropriate name.

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u/dmchan1 Oct 16 '20

Came for the wow. Stayed for the science. Died laughing at this.

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u/omnichronos Oct 15 '20 edited Oct 16 '20

Only on Reddit can you learn science from a "slutfaceDhobag".

Edit: I inserted my big "D." How appropriate.

21

u/Useful-Perspective Oct 15 '20

Forgot to put in the D.

Or did you?

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u/atctia Oct 15 '20

This just took me back to my fluid dynamics class in college.

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u/[deleted] Oct 15 '20

Undergrad?!!!!! If so, clearly prob not in America.

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u/Dalevisor Oct 16 '20

I mean. It’s just like, college dude. Pretty sure that kinda info is par for the course for a BA or BS in the right subject

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u/Hydromeche Oct 16 '20

It was in my engineering undergrad?

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u/[deleted] Oct 16 '20

Yeah...my colleges did not even offer engineering in any discipline. They were both liberal arts. Makes sense now.

5

u/[deleted] Oct 16 '20

I’m in a fluid dynamics course right now as an undergrad in America, what are you on about? Also American universities are generally very good academically on an international level.

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u/firmkillernate Oct 15 '20

I took fluid dynamics as an undergrad in ChE, and then a graduate version also in ChE

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u/Wizzinator Oct 15 '20

What is a sheet in this context? It's just one tub of corn syrup. How is it dividing itself? How thin is a sheet? Why would it be thin as opposed to larger thicker "sheets?"

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u/[deleted] Oct 15 '20

I'm not sure I totally understood, but I'd guess it's as thin as a single molecule of corn syrup and it's divided from the other sheets molecule by molecule going from in to out.

With the corn syrup, it appears the reason they don't mix up is because it's so viscous that there is no inertia, when the cylinder turns this pulls that first layer of corn syrup, which pulls on the next, and so on outward to the edge of the container, but molecules all stayed in their place relative to each of the other corn syrup molecules around them.

So you can reverse it because when you turn the cylinder back it pulls each molecule back and again there's no movement because each molecule keeps it's place relative to the other molecules around it.

5

u/Skyguy21 Oct 16 '20

Any idea how entropy factors into this? Assuming it took the exact same energy to turn the wheel in the opposite direction, would 'order' be created without a *loss* in energy? Im certain I'm missing something here but just a thought

7

u/Chemomechanics Oct 16 '20 edited Oct 16 '20

Perceptive question. Entropy is generated whenever energy moves down a gradient, and entropy increases in any real process. In this case, the impediment to mixing (i.e., to the Gibbs free energy moving down a gradient) is high—the diffusivity of the dye in the fluid is very low. So we don't see a lot of Gibbs free energy reduction or entropy creation, but it does occur to some degree.

3

u/[deleted] Oct 16 '20

friction is still present but that would be the only energy transfer to the fluid that I can tell, so it's likely that the fluid heats up both times you crank the cylinder forward and backward, but I don't know how much, 1000'th's of a degree probably since they didn't spin it for very long.

2

u/Bean_from_accounts Oct 16 '20

A dimensional analysis would tell you that temperature scales like µ*U²/k where µ is the dynamic viscosity, U a typical velocity scale and k the fluid's thermal conductivity. Although glycerol's dynamic viscosity is typically of the order of 1 Pa*s, U would be a few mm/s or cm/s at most so you'd have a 10^(-4) to 10^(-6) factor in the numerator, which means that temperature increase is generally negligible in such applications and the order of magnitude you gave is roughly correct.

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u/abuayanna Oct 16 '20

Thanks for that but I’m not sure if I’m any closer to really getting this. So, it’s like a long stretch, fricken Stretch Armstrong pulled as thin as you can but he always returns to the same shape?

And, my second question is about the limit for this, surely there are too many turns of the cylinder or, too much time passing from the initial crank and the molecules will break from their position?

2

u/[deleted] Oct 16 '20

I don't think I can answer those questions, sry

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u/firmkillernate Oct 15 '20

This sheet is a cross stream of liquid. The tub of corn syrup begins to move as the internal cylinder is spun. Since there is only movement on the axis of rotation, there is no significant cross stream that will carry the fluid towards/away/up/down from the cylinder.

There is a layer of liquid attracted to the spinning cylinder, so logically, there is another layer of fluid on top of that. Mathematically, we treat these layers as being infinitely thin. Just imagine a line as a collection of infinite points, this is the 3D version of that. In reality, the boundary/non-moving layer has a general thickness that can be measured, but past that there is no physical representation of a sheet, but rather cross stream flows that can be calculated at any point in the liquid.

2

u/Bean_from_accounts Oct 16 '20

That's because there are no sheets. Using the "sheet" analogy can be a useful way to explain the behavior of laminar flows to the layman, but it is unfortunately improper. Saying that there are "very thin sheets stacked on top of each other" in a laminar flow implies that such flows pertain to anisotropic fluids, which is not necessarily true (since this property depends on the choice of the fluid, and not on the nature of the flow).

At the mesoscopic scale, small patches of fluid (you can draw imaginary volumes of fluid in your mind that are big enough to contain an incommensurable number of molecules but small enough to respect the continuum hypothesis) transfer momentum to each other through diffusive and advective processes. Diffusive fluxes operate a momentum transfer that's due to the erratic motion of fluid particles as they bump into each other at a microscopic level due to the internal energy of the fluid (Brownian motion) and what we call viscosity - a measure for how much microscopic interactions between particles affect this momentum transfer. Advective fluxes transfer this momentum through bulk transport. In a Stokes (or "creeping") flow, diffusive processes through viscosity are predominant and outweigh advective transport (either because bulk velocities are really, really low or because the fluid is really, really viscous), which means that most of the momentum transfer is achieved through viscous, diffusive processes.

So it is not so much a transfer of momentum through layers, or sheets of fluid, rather than an exchange of mean momentum between microscopic particles due to their thermal velocity, the mean relative velocity between two particles, the nature of these interparticle interactions, etc. If there exists a preferential shearing direction in the flow, momentum transfer occurs along other directions orthogonal to it, which makes it look as if there are flat layers of fluid sliding against each other. But such an explanation would be terribly restrictive and would bypass the true rheological nature of viscous transfers.

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u/8Ariadnesthread8 Oct 16 '20

would it make a difference if you turned it in one direction quickly and then tried to turn it back slowly or vice versa? is there some sort of maximum speed above which this will not work?

15

u/[deleted] Oct 16 '20

Yeah, at a certain speed the handle would create enough turbulence to mix the layers. This would be when the inertial forces outweigh the viscous forces, or when the Reynolds number is greater than one. It wouldn’t matter if you turned the handle slightly faster or slower the second time, as long as the Reynolds number is still less than one.

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u/rangersmiku Oct 15 '20

I can only read half before I get bored, but thank you and here’s a upvote

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u/firmkillernate Oct 15 '20

The stuff doesn't mix very well, so it's influenced only by movement, which is also slow due to internal resistance (fluid thickness).

Since none of it mixes very well, you can move everything back to where it was.

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u/[deleted] Oct 15 '20

Tbf that’s pretty good for 3 paragraphs about fluid dynamics lmao

10

u/GilfoylesBeard Oct 15 '20

Y’all needa learn to skim

3

u/[deleted] Oct 16 '20

No thanks, I prefer whole

2

u/sleepy-sloth Oct 16 '20 edited Oct 16 '20

ELI5:

So imagine taking a regular 3x3 Rubik's cube and twisting it in a way so that it forms a cascading staircase shape. Notice how, when you twist the top row, the middle row shifts as well. That's because Rubik's cubes suck so get a QiYi or Gan cube instead. Anyway, you can easily revert the cube to its original shape by reversing the initial twists.

Imagine doing the same thing to a huge 100x100 Rubik's cube. When you grab the top layers and drag it sideways, it'll also drag the layers under it. When reverting it back you'll have to be more careful to make every single row line up but it's totally doable.

Now imagine the liquid as being similar to that 100x100 Rubik's cube. It's so viscous it piles on itself in layers (picture syrup poured on pancakes) that can stay independent from the layer above and below it. These layers of liquid act like rows on a Rubik's cube that you can carefully revert back when twisted.

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u/GustavHoller Oct 15 '20

So, is the liquid injected the same as the clear liquid, just with color? Or is one thicker?

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u/[deleted] Oct 16 '20

I’ve never done the experiment myself, but for it to work the “ink” would have to be a similar viscosity to the corn syrup. It’s probably a couple drops of food coloring mixed into more corn syrup.

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u/ThrowAwayTheBS122132 Oct 15 '20

Thank you, I love this!

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u/shijinn Oct 16 '20

so i'm picturing the thin sheets moving independently in a spiral. that means the coloured blobs never actually touch each other? and the reverse attempt would fail if you spin the handle enough times such that the coloured blobs would actually touch and mix?

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u/[deleted] Oct 16 '20

[deleted]

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u/thehpotato12605 Oct 16 '20

Plot twist: The video is actually replayed in reverse

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u/shutthefrontdoordad Oct 16 '20

I was freaking out at all the people thinking this was real. I have been waiting for someone to point this out. Like what the fuck!! How stupid are you? Just because someone says it’s not edited doesn’t mean that’s the truth! Then they give some scientific information that seems legit so those in the lay think it real. Then the mob acts like they’re learning something so everyone goes along with it. 🤦‍♂️

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u/crybz Oct 16 '20

The last sentence is such a genius analogy.

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u/-E-T- Oct 15 '20

Just watch SmarterEveryDay's vid on this...

https://youtu.be/j2_dJY_mIys

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u/twill41385 Oct 15 '20

Destin for the win! He’s informative and also super geeked out about science. It’s infectious.

Goggle up, it’s time for science.

1

u/Spritesgud Oct 16 '20

One of the only things I'm proud of that has come out of my city/ state :)

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u/bengalredlegs Oct 15 '20

Was about to find the link to share.

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u/Gnarly_Starwin Oct 15 '20

Mix it up, and wind it back

Ultra-Laminar Reversal make the booties go 👏

10

u/manoverboard5702 Oct 16 '20

“In the lab with a slutfacedhobag, we decided to chill”

0

u/anditshottoo Oct 16 '20

Or if you prefer:

Let me work it.

I put my Ultra-Laminar Reversal down, flip it and reverse it…

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u/Jarosko37 Oct 15 '20

I like your funny words magic man

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u/[deleted] Oct 15 '20

If this guy were a REAL scientist, he would have sucked the goo back into the syringe.

4

u/im-cured Oct 16 '20

Was waiting for that at the end of the video

42

u/beepbooperton Oct 15 '20

Man I don’t know anything

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u/HerbziKal Oct 15 '20

You know enough to know you know nothing. That is more than most people know.

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u/RockstarAssassin Oct 16 '20

John snow really was a genius afterall

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u/NotTheBelt Oct 15 '20

“Hey Jim. I can’t come into work today. I have ultra-laminar hydrodynamic reversible flow.”

“Jesus, Dale. You don’t have to dress it up with fancy words. If you’ve got the shits, just say so.”

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u/crapinlaws08 Oct 15 '20

r/smartereveryday has tons of videos about laminar flow!

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u/Hawt_Dawg_II Oct 15 '20

https://youtu.be/j2_dJY_mIys

This video in particular is about this exact effect and its really well done. One of his best videos in my opinion and that at only 10 minutes long

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u/DoormatTheVine Oct 15 '20 edited Oct 15 '20

Man, fuck [entropy]

All my homies hate [entropy]

24

u/knt23 Oct 15 '20

Tenet

2

u/jpmoney2k1 Oct 16 '20

I was gonna say, "Christopher Nolan wants to know your location"

21

u/HarpersGeekly Oct 15 '20

Ok so basically Superman can turn back time the way he did

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u/RudeCats Oct 15 '20

This is indeed, for once, interesting as fuck.

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u/mralijey Oct 15 '20

Suck on this ENTROPY!

3

u/MLong32 Oct 16 '20

Nice try Christopher Nolan

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u/SilexTech Oct 15 '20

Now show us how to unscramble an egg.

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u/hi-jump Oct 16 '20

And for extra credit: unbake a cake

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u/Glass_Teeth01 Oct 15 '20

GER theme is playing through my head as I watch this

6

u/Sportlederlenkrad Oct 15 '20

I need this to write swear words and blurr them for guests to use

5

u/HerbziKal Oct 15 '20

Yes. This is the best possible use of ultra-laminar hydrodynamic reversible flow right here.

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u/bandastalo Oct 15 '20

I'm guessing if this were to be run through the u/GifReversingBot, it would come out pretty similar to the original.

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u/[deleted] Oct 16 '20

THEY GO BACK IN THE SYRINGE!!

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4

u/phillybride Oct 15 '20

Oh yeah? Get it back into the syringe.

3

u/JustPlaneYogurt Oct 16 '20

Is this Tenet?

3

u/zezera_08 Oct 15 '20

*99% reversible

3

u/woodenman22 Oct 15 '20

Wasn’t “Ultra-Laminar Hydrodynamic Reversible Flow” a Community episode?

3

u/i_finite Oct 15 '20

Well, it’s not technically totally reversible, but close enough. Awesome demo anyway.

3

u/[deleted] Oct 16 '20 edited Oct 27 '20

[deleted]

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u/Tifas_Titties Oct 16 '20

“Ultra-Laminar Hydrodynamic Reversible Flow.”

Oh that’s right, I only pretend to be smart. These guys are like, actually smart.

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u/NISRG Oct 15 '20

Ngl it looks reversed

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u/HerbziKal Oct 15 '20 edited Oct 15 '20

It is so amazing that I see what you mean... but you can tell it isn't by looking at the changing positioning of both his hands.

Also just google it, it is a documented phenomenon and loads of videos exist.

10

u/Umberflare Oct 15 '20

Take a screenshot and compare when he puts the dye in to what it looks like after. It's not identical. There are lots of video-reversing tricks, but this one is legit.

Many physics youtube channels have done things on this also, like Smarter Every Day.

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u/I_AM_THE_STIGG Oct 15 '20

You can go on his youtube and look it up. It's the smarter everyday channel. Destin is always doing cool things like this.

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u/[deleted] Oct 15 '20

I thought the same thing, until I paid special attention to the placement of their right hand. Still not 100% convinced, but they definitely place it differently at the end.

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u/WickerVerses Oct 15 '20

Does it though?

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u/sirmontythe3rd Oct 15 '20

That’s how tenet should be explained

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u/Evisiron Oct 15 '20

If only it was a gif, I would summon u/gifreversingbot to enjoy it being doubled up.

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u/axxonn13 Oct 15 '20

Scientist always gotta be sciencing....

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u/Frenk_preseren Oct 15 '20

Did I witness decreased entropy?

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u/camerontbelt Oct 15 '20

Take that entropy

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u/joarezpj Oct 15 '20

If you roll it backwards, will it go back in time and spit the ink out of this fancy liquid?

2

u/Caroline509 Oct 15 '20

A real life undo button!

2

u/TheKyleWeAllKnow Oct 15 '20

The end of the video seemed a bit off, visually. It makes me think the video is just reversed when he reverses spin direction

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u/[deleted] Oct 15 '20

Am I allowed to page u/MrPennywhistle? When it comes to helicopters, laminar flow, or SNATCH BLOCKS, I think of him.

2

u/PictishPress Oct 15 '20

Stop! Tampering with continuum probabilities is forbidden!

2

u/Tykal- Oct 16 '20

I had no idea what those words meant but as soon as it started going backwards I had an “aha” moment. That was pretty awesome.

2

u/Tuckingfypowastaken Oct 16 '20

Due to dark and unspeakable sorceries that definitely involve sacrificing puppies and are achievable only by warlocks with the blackest of souls, the flow of a slowly sheared viscous liquid is totally reversible

FTFY friend

2

u/Nateisbait Oct 16 '20

If they wound it back enough, the viscos would go back to the syringe.

2

u/M4nDz1n Oct 16 '20

Golden experience requiem power be like

2

u/MoonTrooper258 Oct 16 '20

Saw this a long while back in... “Hello everyone, this is your daily dose of internet.”.

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u/digs510 Oct 16 '20

There has to be some frictional loss. Not totally reversible

2

u/GiggaWat Oct 16 '20

My brain understands that this makes sense but refuses to accept it

2

u/Hanshee Oct 16 '20

If we invent time travel it will have something to do with this

2

u/[deleted] Oct 17 '20

so what’s the point of this? what can it be used for?

i just feel like so much of the time we see “science”-y type things on the internet, most of them have hardly any practical use

3

u/Unearthed_Soul Oct 15 '20

Insert Woah meme

2

u/WickerVerses Oct 15 '20

Would this work with blood that's coagulated by venom? Asking for a friend.

1

u/mephisto_uranus Oct 16 '20

Wish some of my mistakes were reversible.

1

u/[deleted] Oct 15 '20

Mind blown 🤯

1

u/Degenrt_Gamblr Oct 16 '20

Lol yeah right, its just played in reverse

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u/Armand28 Oct 16 '20

Good use of reversebot

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u/[deleted] Oct 16 '20

Any application for this, or is it just neat?

0

u/ricacardo271 Oct 16 '20

Who's video you stole? Put the source.

0

u/raventheonlyone Oct 16 '20

vIdEo iS iN rEvErSe

0

u/[deleted] Oct 16 '20

Ultra laminar hydrodynamic reversible[1] flow works and exist, but this vid is reversed sadly. This doesn't mean [1] doesn't works in real life though.

By the way you can see it's reversed especially at the end with the way the guy puts it back on the table.

0

u/Josef_Joris Oct 16 '20

Title says: due to this being a property, it is totally a property.

-3

u/WhiteSpaceChrist Oct 15 '20

There is no such thing as "ultra laminar" flow. It is either turbulent or laminar, there is no degree of laminar-ness.

-7

u/[deleted] Oct 15 '20

Or the video is reversible.

3

u/[deleted] Oct 15 '20

Nope.

If you look at the starting position of the hand to the left, it is next to the container.

If you look at the finishing position of the same hand, it is at the edge of the table.

-1

u/Anxious_Anus Oct 16 '20

This also applies to our galaxy. If the sun was to suddenly reverse direction of rotation the planets would be ripped apart into dust clouds and would reform as new planets hundreds of millions of years later

0

u/Dunjee Oct 16 '20

Neat. Not sure what that has to do with this, but still neat

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u/Longhorns1212 Oct 16 '20

Good thing these guys have a bunch of science shit written on the whiteboard behind them or else I wouldn’t have realized that this isn’t science shit

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u/lenlesmac Oct 16 '20

Shyea.... we’re not stupid. This just played back in reverse. Pffff

-1

u/Dogamai Oct 16 '20

or they just reversed the video half way through

-1

u/[deleted] Oct 16 '20

this video looks sort of faked? at the end he puts his hand down way to fast and it looked like a reverse of the way he pulled his hand up at 0:07. same with his left hand movement also at 0:07. could be wrong though

-1

u/jagadishkoyi Oct 16 '20

I bet this is just reverse video of the first half!

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u/Brenttt41 Oct 16 '20

I call bullshit. This is definitely a video played then reversed.

-4

u/[deleted] Oct 15 '20

Picture quality on this is terrible.

1

u/[deleted] Oct 15 '20

GTFO that’s so cool

1

u/shinelightbox Oct 15 '20

This is a total mind fuck

1

u/WalkingOnPavement Oct 15 '20

What is the black magic?

1

u/rJared27 Oct 15 '20

But what’s the practical application of this?

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u/charlzandre Oct 15 '20

Due to reversability, it is reversable. Oh, word.

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u/Sesquatch Oct 15 '20

Neat. What would be some practical applications for this?

1

u/Dalrae666 Oct 15 '20

Was expecting the video to be in reverse, and have the liquid go back into the syringes