Water Is Thicker When You’re Smaller 

That bacterium at 7:20 was I think the biggest one we found. They create giants before cell division and mesmerizing to watch! -James

Fluid mechanics is cool as long as you don't actually do any math.

Something interesting about viscous fluids -- when the Reynolds number is low enough, reciprocal (reversible) motion doesn't work. If you try to push yourself forwards with your arms, you'll just pull yourself back when you bring them back up. So microbes have to come up with time-chiral ways of motion, usually ones that involve spirals or alternating patterns and such.

I am become syrup, topological features of worlds

The viscosity of the water at that scale is also why flippers/fins aren't seen in the microbial world.

Wow, I'm a Mechanical Engineer with 11 years experience, took thermofluids, heat transfer, and fluid dynamics - THIS IS THE BEST EXPLANATION OF REYNOLDS' NUMBERS THAT I'VE EVER HEARD!

5:29 - Bizarre things we see in the microscope world: A single-celled organism trying to eat a multi-celled organism!

Microfluidics is a really interesting field. You can get outrageous yield in microrreactors, but the mechanics of micro pipes are something else.

*It's not easy swimming smol, just trying to get around is an entire workout!*

This is all very mind blowing, but my question is: as you get smaller and smaller, at what point does the Brownian motion of the fluid begin to dominate the viscosity? I’m wondering specifically about small molecules floating around inside cells... haha and as long as I’m on the train of thought, would also be interesting to peek inside the internal structure of a thermophile

This is one of my favourite science concepts. Purcell's paper 'Life at low reynolds number' is absolutely amazing

All this DIC footage is incredible!!!

“Sometimes the syrup is water, and sometimes the syrup is you” ~Hank Green

The word Microscosmos hits you very differently when you suddenly realize the absolute minboggling amonts of space the bacteria are working with. It quite literally is another world.. wow

I was binge watching this channel and now a new video appears. Service 100%

"Fluid dynamics ahead" Students: *COLLEGE PTSD FLASHBACK.*

Oh, that smooth, buttery 4k60fps... thank you so much!

As an aerospace engineer, this is probably my favourite episode so far. I hope you make more videos about microcosmos propulsion!

I don’t know why I like this series. It’s just so relaxing to look at.

5:30 "Single-celled organism tries to eat a tardigrade" Are you kidding me? You tried to eat to the John Wick of the cell world!?!?!?!

2:07 aww he's trotting :D

This was a particularly well explained episode.

4:25: I just love the way that broad-tailed blue-colored snake thing moves.

Currently fighting Lyme disease so these spirochete images were especially interesting to me ! Thanks !

1:37 - it looks like flying eggs

And that's why doing miniatures in movies involving water is so hard... water doesn't scale.

I wish this channel would dig much deeper into the science

Love the content, it would be great to see some creatures from sea water, there is whole other world out there :)

"Sometimes the syrup is water, and sometimes it's you!" 😆

6:25 Was on the edge of my seat waiting for that thing to topple over

1:44 Hank [Intellectual monologue] Me: "Hurr hurr, fried eggs go whizz"

That Arthrospira around 06:30 is mesmerising. Right-hand thread, I guess they all are probably. Even the Australians.

Thanks for thoroughly creeping us out with the spirochaete ending.

Reynold's Number....I have just learned something!!! Never too old!.......

Glad to know I'm Home.

I love it that Microcosmos is becoming more frequent in its posts!

the milnesium crawling upwards is so bloody cute

Came here from the scishow ep about big cells, and I'm so excited about this channel! Huang and Green are a good team. :)

I love what you said "but for microbes it is just home"

Excellent presentation and great voice

7:57 little elefant spirochete

Kind of like the reciprocal of the speed of light. Thanks for the video!

02:15 The Milnesium might be tied with tardigrades! That thing is adorable; why haven't we seen more of them?! We need a whole video just to learn about these little ones!! 😍🤩🤏

Yay!

Dayum I feel so lucky to find this channel today. I have been interested in footages of microscopic world, no doubt that there are plenty of videos about these microscopic organisms uploaded by institutions which show, the footage but hardly explain anything about it. Thanks for sharing this stuff with the world! +1 sub from me

Realizing how big protist cells are when you see that one trying to eat a tardigrade which, if I recall correctly, are comprised of about 2000 cells and here this single-celled protist is larger than the tardigrade!

Especially excellent photography this episode---- absolutely mesmerizing...

"If a man does not have sauce, then he is lost. But the same man can get lost in the sauce."- Gucci Mane

4:56 Heteronema looks a lot like lacrymaria to me. Guess you gotta do a Heteronema video!

Thank you james

the most soothing voice on youtube.

The arthrospira at 6:10? Amazing

Sometimes it’s syrup. . . sometimes it’s you ! Yikes ! Sounds like a line in a horror movie trailer. Haha. Love it !

Narration worthy of a major award on its own 🙂

Journey to the Microcosmos -awesome

rotifers be like [kirby inhaling sound]

Imagining syphilis as a tiny corkscrew worming its way through my blood somehow made the concept of syphilis worse.

Such an underrated channel. Thank you for this amazing content

This in my opinion would lend itself well to a superhero with the proportional powers of a human-sized microbe. Imagine a guy who looks like an Amoeba just casual walking through a wall or ignoring a moderate ocean current.

this video is so interesting. I was wondering why syrup seemed so fluid when I put it in a large container but then its viscosity went through the roof when I poured it into a spoon. This video helped me realize that the scale matters

Those little dudes sure are fast! Pretty cool!

When i saw the milnesium a 2:00 I audibly gasped. I LOVE TARDIGRADES!

@2:15 so cute watching it walk upside down to the macroscope.

6:59 the photobombing ciliate tho

Spirochete has figured out how to harness the spiral force

Wow! If only my high school science teacher had made it this interesting. Amazing. Thank you

Had not watched the video yet, but wanted to say thank you for being awesome and keep up the fantastic work

Subscribed. This is so hypnotic

I knew from the title that this episode was about fluid dynamics. And it was obvious that smaller creatures experienced greater viscosity. However, I didn't think bigger, as with the whale. And I didn't connect movement with the Reynolds number. And it's clear that the Reynolds number connection is as important as you describe. Also, the connection with microcosmos locomotive organs is very insightful. The differing kinds of locomotive organs is also very great and not predictable to our limited experience as humans. Specifically, the difference of cilia and animal legs is as large as the scale differences. Legs work very well at the interface of a solid, low Reynolds, and the tenuous air with very high Reynolds numbers. As Feynman pointed out, all of that IS in the equations of fluid dynamics, but we have just the smallest glimpse of the solutions of the equations. (I know, Feynman wasn't speaking about specially about fluid dynamics, but rather differential equations in general and physics in particular.) I'm retired, but I can't help but wonder how my life would have been different if mathematics was used so much in other sciences than physics and math when I was young and choosing a career. Thank you for another very insightful program.

Superb 👏👏👏. Thank you 🙏

Thanks for the episode~

Oo! Seeing the slowed down footage made me think, you guys could set up a proper slow motion camera to look at microbes with flagella! It would be really cool to see those tiny little hairs moving in a more perceptible way in really high resolution and framerate.

spirochetes are enchanting.

Well show. Good information.

The RYAN reynolds number. ... _fixed that for you_ 😃

Love One Another God Bless Everyone

Warning: Fluid dynamics ahead. I felt that.

2:00 *he strollin*

i can't believe liquid dynamics uses the dennis system

*Got it- I'll just bathe myself in water and become resistant to coronavirus :)*

One of these days this channel is gonna drive me to impulse buying a microscope, and it's gonna be AWESOME.

Muchas gracias.

Very interesting information on biology of life.

Marvelous.

Wow! It’s really difficult to get bacteria to show up clearly in light microscopes! I’m really impressed by the footage of the spirochete toward the end of the video.

Hello from Turkey

although i don't know how possible it would be, i'd love to see an episode about fairy wasps and how their wings and flight mechanisms have adapted to the micro scale. for those who don't know, fairy wasps can be smaller than some amoebas.

wait till i tell my homie whats in that syrupp.

Yes

Amazing and thank you!

This is the most interesting stuff I've seen for a while.

I am becoming increasingly interested in cellular biology, organic molecular machinery and structures, abiogenesis (pre-evolutionary, pre-life, inorganic to organic chemical compound synthesis), and the microcosmos of prokaryotic and eukaryotic organisms. It is fascinating that tiny virophages can actually infect viruses many times larger than them, which in turn are minuscule entities that can be harmful to us. It is also paradoxically amazing that a single cell bacterium can be a predation threat to the smaller, yet 1000 cell, tardigrade (water bear). The scale, scales within scales, and diversity of the microcosmos in a droplet of water is not just the only thing that is astounding. What is even more intriguing are the questions of how much of this complexity existed pre-multicellular animals, and how much has co-evolved and become more complex since multicellularity came about.

What about a video on ageing and lifespan duration?

Incredibly shot

Thank You!

it’s goodyou’re the brother with the cool youtube channel & not the one that got bullied off tumblr

So... Fluidic Space from Voyager, got it

Thank you for making it a broad explanation I am kinda dense

Watching that arthospira is so trippy

Could you guys plz do a video on a range of recommended microscopes to buy for those of us that really want something good for home use.🙏🙏🙏🙏🙏