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John Sebastian

@johnseb

Fluid Mechanics, etc https://john-seb.github.io/

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07.01.2024
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Latest posts by John Sebastian @johnseb

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๐ŸŽฎ pokemon tree of life

for pokรฉmon's 30th anniversary, explore a visualization and field guide to 1,000+ pokรฉmon. what inspired them, where they came from, and how they connect.

ํฌ์ผ“๋ชฌ 30์ฃผ๋…„, 1,000๊ฐœ ์ด์ƒ์˜ ํฌ์ผ“๋ชฌ์„ ์‹œ๊ฐํ™”ํ–ˆ์Šต๋‹ˆ๋‹ค!

โžก๏ธ str.sg/viz-poke30

27.02.2026 05:18 ๐Ÿ‘ 8 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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It took me quite some time, but the article following a talk at the DFD 2024 is finally online! Clogging is widespread, but the associated physics remains poorly understood. I am trying to give a (biased) view and some general knowledge here: doi.org/10.1103/rfk8...

23.02.2026 23:35 ๐Ÿ‘ 4 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Our new paper, led by @ramsudhirsharma.bsky.social (with Alexandre Leonelli, Kevin Zhao, Eckart Meiburg), has been published in @apsphysics.bsky.social PRL. We revisit hourglasses/silos and ask what really sets the discharge rate. See more here: doi.org/10.1103/3g2f-nslz

18.02.2026 02:48 ๐Ÿ‘ 10 ๐Ÿ” 3 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

๐Ÿงชโš›๏ธ

30.01.2026 19:39 ๐Ÿ‘ 4 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Weโ€™ve been putting together a small device to study flow through pores, where geometry matters and minor imperfections can make or break the experiment. The goal is simple to state and nontrivial to execute. One early prototype looks, quite unintentionally, like a Picasso: a face, a pair of eyes.

23.01.2026 12:13 ๐Ÿ‘ 5 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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@leakey77.bsky.social and colleagues combined laser confocal microscopy with gas exchange measurements to enable the real-time observation of living plant stomata! ๐Ÿงช

academic.oup.com/plphys/artic...

08.01.2026 00:41 ๐Ÿ‘ 53 ๐Ÿ” 12 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 2
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3D printing meets fluid mechanics! Thrilled to see our Annual Review of Fluid Mechanics article on direct-ink writing featured by @utknoxville.bsky.social. With Brett Compton & @raytyler.bsky.social : tickle.utk.edu/mae/news/com... @annualreviews.bsky.social @univofmaryland.bsky.social

06.01.2026 18:05 ๐Ÿ‘ 12 ๐Ÿ” 6 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

My first PhD paper with Prakash Lab is out in its final form! Here we uncover the many folded forms of Placozoa and how cilia unfold them. Enjoy the paper and our stop motion summary of this story!
www.pnas.org/doi/10.1073/...

23.12.2025 18:47 ๐Ÿ‘ 17 ๐Ÿ” 3 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
LinkedIn This link will take you to a page thatโ€™s not on LinkedIn

Please fill short application form to be considered as a โ€œglobal cohortโ€ student. No fees, no restrictions. We are looking for passionate individuals that like to work in teams with a โ€œfrugalistโ€ philosophy to find scalable solutions to global challenges.

Deadline: 9th January

lnkd.in/gxftkgz

04.01.2026 21:53 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Frugal Science

After all the anticipation - FrugalScience 2026 - a collaborative global collective is LIVE again for 2026 season.

www.frugalscience.org

Apply - deadline 9th January (midnight)

04.01.2026 21:53 ๐Ÿ‘ 22 ๐Ÿ” 11 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Cilia-driven epithelial folding and unfolding in an early diverging animal | PNAS Multicellular organisms utilize epithelial folding to achieve remarkable three-dimensional forms. During embryonic development, stereotypical epith...

(2/n) In our latest paper in PNAS, led by an incredible graduate student @cbrannon.bsky.social - we show a bizarre world of "cellular plate tectonics". Imagine a self-folding origami with a mind of its own. A living sheet that does not need any instructions to fold.. www.pnas.org/doi/10.1073/...

19.12.2025 07:47 ๐Ÿ‘ 1 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Reflections #FluidsFriday

19.12.2025 08:15 ๐Ÿ‘ 1 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

๐Ÿ˜ฎ

18.12.2025 17:03 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

@cambup-scieng.cambridge.org

12.12.2025 16:17 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

๐Ÿงชโš›๏ธ A counterintuitive finding:
doi.org/10.1017/jfm....

(Physics-1, John-0)

12.12.2025 10:36 ๐Ÿ‘ 5 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Where words meet the natural world An annual symposium in Friday Harbor explores what happens when poetry and science coalesce.

A nice write up of the Science/Poetry meeting we have every year here at Friday Harbor Labs.
salish-current.org/2025/12/11/w...

11.12.2025 17:23 ๐Ÿ‘ 4 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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William Pickard developed an elegant analytical solution to describe low-Reynolds-number flow in long cylindrical cells. This setup resembles the classic Couette flow, but in this case, the velocity depends on the angle and the radial position (normalized by the cell radius) buff.ly/RcuIAyW

05.12.2025 11:30 ๐Ÿ‘ 1 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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It's #FluidsFriday, and we're featuring another sample from the hydrodramatic toy collection. A rising Taylor bubble generates a swirling flow inside a sealed cylindrical tube.

28.11.2025 07:45 ๐Ÿ‘ 1 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

๐Ÿงช โš›๏ธ ๐ŸŽข ๐Ÿ‘ฉโ€๐Ÿ”ฌ

26.11.2025 00:03 ๐Ÿ‘ 12 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Roses donโ€™t just defend themselves. Their prickles are geometrically ideal for gripping surfaces, supporting vertical growth, and, when needed, creating lacerations that deter herbivores. Students - join us to investigate how biological form and physical law work together!

25.11.2025 17:31 ๐Ÿ‘ 7 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1
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I am looking to hire PhD students to join our Multiphase & Multiscale Flow Lab in Mechanical Engineering @univofmaryland.bsky.social
Background in ME, Physics, ChemE, Civil (or related), interest in fluid mechanics/soft matter, and hands-on lab work are key.
Please help spread the word!

25.11.2025 22:38 ๐Ÿ‘ 6 ๐Ÿ” 6 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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New paper!๐Ÿ’ก Amir Ohad developed this nifty setup to measure weak forces generated by freely moving plants, based on the deflection of a pendulum (straw from the cafeteria ๐Ÿ˜Ž), which does not require any tethering of the plant: academic.oup.com/jxb/advance-...
Plant-obstacle interactions here we come!

02.11.2025 07:34 ๐Ÿ‘ 13 ๐Ÿ” 5 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1
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โ€œCellular Olympicsโ€ our catalog of freeky ultra fast cellular superheroโ€™s is freely available โ€œAnn Rev of microbiologyโ€

www.annualreviews.org/content/jour...

This is a compilation of worldโ€™s fastest single cell organisms - enjoy this buffet of rare delightful protists with mind bending speeds. ๐Ÿงช

24.10.2025 10:57 ๐Ÿ‘ 114 ๐Ÿ” 41 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1

An intimate conversation about what drives me every day in โ€œsharing experienceโ€ of science by getting tools of science in hands of kids everywhere.

themicroscopists.bitesizebio.com/episodes/man...

31.10.2025 12:30 ๐Ÿ‘ 32 ๐Ÿ” 11 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Congrats @laurentformery.bsky.social

Often people ask why we chose to work on a certain problems and a simple answer for us in this case - itโ€™s beautiful. If you want to learn the magic of building crystalline ยซย gemsย ยป inside the body - see our latest paper at www.biorxiv.org/content/10.1...

18.10.2025 20:18 ๐Ÿ‘ 47 ๐Ÿ” 8 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 2
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Sharpen your knives! High-speed video analysis reveals that blunt knives and faster cutting speeds release more eye-irritating droplets from onions by building pressure under the onionโ€™s skin before the ejection of the tear-inducing aerosols. In PNAS: https://ow.ly/5rc750Xcvhj

16.10.2025 23:00 ๐Ÿ‘ 12 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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One day in the lab, we accidentally discovered that the spines of a cactus ๐ŸŒต straighten when exposed to fog. I was intrigued and so were my collaborators. How does this work and what can be gained from it? Here are some of the answers in our new preprint:
doi.org/10.1101/2025...

08.10.2025 15:25 ๐Ÿ‘ 69 ๐Ÿ” 24 ๐Ÿ’ฌ 4 ๐Ÿ“Œ 6
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Our new study from Joanne Steinerโ€™s PhD work and with C. Morize, P. Gondret, and I. Delbende has just been published in Phys. Rev. Fluids! We study vortex rings generated when a disk moves toward or away from a wall. doi.org/10.1103/ynxr...

14.08.2025 13:47 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

What a great discovery and story!!

23.07.2025 19:12 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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๐ŸšจDonโ€™t miss out! Last weeks left to register for the Plant Computational Biology Workshop 2025, sponsored by @cambup-lifesci.cambridge.org ๐ŸŒฑ
๐Ÿ“†Deadline 31 July - www.slcu.cam.ac.uk/computationa...
#ComputationalBiology #PlantSci

23.07.2025 08:14 ๐Ÿ‘ 18 ๐Ÿ” 8 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0