Owen Maresh

A top-down closeup photo of a pale yellow flower with serrated-tip petals, with the ground and leaves below out of focus. There are two little moths in the flower; the moths have a fuzzy gray thorax, and cream-colored wings with thin bands and edges of deep pink.

These pretty, day-flying moths (Heliolonche pictipennis), only about 1 cm. long, are one of my favorite desert spring insects. The only flowers they visit (desert dandelion, desert chicory, or scale bud) close up at night; the moths sleep inside them, which is scientifically adorable. #BugSky 🌿🐙🌼

A new clue to how the body detects physical force

PIEZO2—unlike PIEZO1—is tethered to the actin cytoskeleton, enabling sensory neurons to detect localized mechanical forces such as light touch.

Findings reported in @nature.com by @ericmulhall.bsky.social from @ardemp.bskyverified.social's lab link nanometer-scale imaging to sensory function.

EllipsePerimeter[a_, b_] :=
2*Pi*Sqrt[a*b]*LegendreP[
1/2, (a^2 + b^2)/(2*a*b)]

from content.wolfram.com/sites/19/200...

this worked for me:

Nv1dia driver, required both a cc mismatch and a modification to KBuild to get it working with mainline 6.19.4

forums.developer.nvidia.com/t/objtool-na...

YouTube video by Simons Foundation C. Vafa, M. Freedman, C. Kane, Jim Simons - Applications of Chern-Simons Theory (April 25, 2018)

www.youtube.com/watch?v=PSEa...

YouTube video by ICOPS openphytoliths Open Research Meeting by ICOPS - 31 October 2025

youtu.be/mwYbxQSYJtY?...

YouTube video by Vladimir Bulatov Oscillating Gears in Gray-Scott Reaction Diffusion

new from Vladimir Bulatov: www.youtube.com/watch?v=VlK9...

Topology of Multi-species Localization Spatial relationships in multi-species data can indicate and affect system outcomes and behaviors, ranging from disease progression in cancer to coral reef resilience in ecology; therefore, quantifyin...

arxiv.org/abs/2603.03237
/Topology of Multi-species Localization
Abhinav Natarajan, Thomas Chaplin, Joshua A. Bull, Eoghan J. Mulholland-Illingworth, Simon J. Leedham, Helen M. Byrne, Maria-Jose Jimenez, Heather A. Harrington (@haharrington.bsky.social}

"functoriality obstruction"

YouTube video by Simons Foundation Stephen Quake: A Cellular Mystery: How Do Many Cell Types Arise From a Single Genome?

www.youtube.com/watch?v=GSpb...

gas blurs out.

you fill a glass with carbonated soda, it foams up:
you know that to figure out where the surface of the liquid will be, it's halfway between the top edge of the foam and the bottom: in some ways it's the opposite of what happens with critical opalescence, where the boundary between liquid and ...

YouTube video by Institute for Advanced Study Beyond Translation-Invariance in Arithmetic Harmonic Analysis - Trevor Wooley

www.youtube.com/watch?v=gtFO...

Zolotarev's Magical Proof of Quadratic Reciprocity We present a creative reimagining of Zolotarev's classical proof of the Law of Quadratic Reciprocity.

@cardcolm.bsky.social :
arxiv.org/abs/2603.00278
/Zolotarev's Magical Proof of Quadratic Reciprocity/
Matthew Baker

A Rigidity Theorem for Convex Sets in Hyperbolic 3-Space Pogorelov's rigidity theorem states that a compact convex body in the hyperbolic 3-space is determined up to isometry by the intrinsic path metric on its boundary. The main result of this paper addres...

arxiv.org/abs/2602.23558
/A Rigidity Theorem for Convex Sets in Hyperbolic 3-Space/
Feng Luo, Yanwen Luo, Zhenghao Rao

Implementing FFTs in Practice This review article was first published in 2008 as chapter 11 in the book "Fast Fourier Transforms," edited by C. S. Burrus, for the Connexions project at Rice University, which is sadly no longer onl...

arxiv.org/abs/2602.23525
/Implementing FFTs in Practice/
Steven G. Johnson, Matteo Frigo

(aside: the Goon show and Bobobo-Bo Bo-Bobo evoke similar feelings of bewilderment)

Nighttime picture of a human-established watering hole in the Namib Desert. It's round, apparently concrete, with a small concrete "island" in the center, and there is an owl at the edge, which we see from behind. The owl's wings are folded against its body in a manner that suggests a short jacket; its legs look like the owl is wearing white stockings, and its head is turned to the left; we can see one eye (shining in the watering hole's low light), and a very little bit of its beak.

ok but why does this owl at a watering hole in the Namib desert (which I saw via the watering hole's webcam) look like a little old English lady-owl on an evening walk who kicked off her shoes but left her stockings on to cool her feet in a pond on the outskirts of the village?

YouTube video by Simons Foundation Scott Sheffield: Random Geometry and Yang-Mills Gauge Theory (February 18, 2026)

www.youtube.com/watch?v=3xCh...

As you slide an osculating circle amongst some curve, something interesting should happen to Apollonian tab-completions (Anosov-esque)

Analogue of the theta group $Γ_θ$ In this paper, we introduce higher level versions of the theta group $Γ_θ.$ In particular, we treat level 3 and 4 versions of the theta group, $Γ_{θ,3}$ and $Γ_{θ,4}$ and prove that $\displaystyle F(τ...

arxiv.org/abs/2602.22471
/[22] arXiv:2602.22471 [pdf, html, other]
Analogue of the theta group Γ_θ/
Kazuhide Matsuda

Volumes of ideal hyperbolic drums Milnor computed the volumes of ideal hyperbolic prisms as part of an effort to construct 3-manifolds whose volumes are finite rational sums of the Lobachevsky function evaluated at rational multiples ...

arxiv.org/abs/2602.22389
/Volumes of ideal hyperbolic drums/
Eric Chesebro, Justin Lanier, Emma N. McQuire, James Morgan, Jessica S. Purcell, Henry Segerman

Mathematical Models of Quantum Chaos by Jens Marklof YouTube video by International Centre for Theoretical Sciences

www.youtube.com/live/HxvuJfv...

YouTube video by Gresham College The Shape of Shells - Professor Alain Goriely

youtu.be/Z332liVw9Jo?...

pastebin.com/V6GH2LVJ
is adjacent, and can be used to generate things like this...