@markdow.bsky.social
he/him
Transition between laminar and turbulent flow below a weir.
22.02.2026 20:47 — 👍 1 🔁 0 💬 0 📌 0
Parking lot trees illuminated from top by lamppost lights, a crescent moon in dark blue sky.
Portland Oregon evening.
20.02.2026 02:42 — 👍 0 🔁 0 💬 0 📌 0Maybe use an oven mitt.
18.02.2026 03:06 — 👍 1 🔁 0 💬 0 📌 0"Waukegan officer shot and killed someone. We don't know who or why."
08.02.2026 06:03 — 👍 0 🔁 0 💬 0 📌 0
Small corrugated roof covered by ice with a spike of ice extending from each corrugation.
Top view of catio roof.
28.01.2026 19:45 — 👍 0 🔁 0 💬 0 📌 0
A uniform row of conical ice forms extending out and down from a small corrugated roof. Dark blue sky behind and red and wire painted cat porch below.
Ice claws after a sheet of ice slid down corrugated roofing and refroze. Picture and catio by Ansel Dow, Durham, North Carolina.
28.01.2026 19:42 — 👍 0 🔁 0 💬 1 📌 0cheetahs too
26.01.2026 00:26 — 👍 4 🔁 0 💬 1 📌 0
Always fun to watch on a day like today:
www.nfb.ca/film/snow_fi...
Black and white photograph of Emmy Noether. She is standing just behind an ornate chair, wearing a white striped blouse with puffy shoulders, a fluffy bow at her neck, and a heavy long skirt cinched with a belt. Her dark hair is pulled back and she is looking a bit to the photographer's right.
Felix Klein lectured “On Hilbert’s first note on the foundations of physics" at the Mathematical Society of Göttingen #OTD in 1918. He included excerpts from letters in which he and Hilbert give priority to Emmy Noether’s results on conservation of energy in general relativity. (1/n) 🧪 ⚛️ 👩🔬
22.01.2026 16:07 — 👍 683 🔁 194 💬 14 📌 10
Needle ice is the correct name. My example is more densely packed than others I've seen: en.wikipedia.org/wiki/Needle_...
20.01.2026 22:35 — 👍 2 🔁 0 💬 0 📌 0
Fingers holding a slab of vertically striated ice, about 2cm thick, sandwiched between thin layers of muck.
Columnar ice, formed under a thin layer of dirt/organics after a cold clear night.
Mt. Tabor, Portland, Oregon
The power and fiber cable system has been upgraded several times since the 1951 installation:
www.opalco.com/quick-fact-o...
Excellent and entertaining documentation of the engineering and laying of an underwater power cable.
www.youtube.com/watch?v=wCHt...
A double Turkish oak acorn case with characteristic prickly acorn cap. Looking like a tentacles of sea anemone
Turkish oak acorn case
16.01.2026 22:14 — 👍 484 🔁 33 💬 14 📌 3
Flight track and data of DHS helicopter above Mt. St. Helens.
Flight track and data of DHS helicopter above Portland and Oregon City on its way to Mt. St. Helens.
The Department of Homeland Security in their fancy helicopter N1977G is keeping Portland safe today by sightseeing around the Mt. St. Helens caldera at 8,000+ feet.
16.01.2026 20:03 — 👍 1 🔁 0 💬 0 📌 0
Deep-sea sponge appreciation post: Bolosoma is a glass sponge that builds vertical structure in the deep sea, creating habitat for a whole host of life. IN 2025 on dives in Papahānaumokuākea, some had heads nearly a meter wide.
📷 NOAA Ocean Exploration, 2025 Beyond the Blue
Handmade framed sign on post near o front door reading “Justice for Renee Good”.
SE Portland Oregon, 2025-01-09
10.01.2026 22:31 — 👍 2 🔁 0 💬 0 📌 0
A picture of green jay feathers (Cyanocorax luxuosus). They are all lined up and organized: primaries, secondaries, coverts, tail feathers. Most of the feathers are gray with a green tip.
I just stumbled upon featherbase, a database of feather pictures from a bunch of bird species.🪶
So pretty!
www.featherbase.info/zh/home
Furry ice curls on branches.
Furry ice curls on branches.
Furry ice curls on branches.
Furry ice curls on branch, next to a sword fern.
Hair ice, this morning on the Buxton-Vernonia trail, Oregon.
31.12.2025 22:03 — 👍 3 🔁 0 💬 0 📌 0@socialgoodplace.bsky.social
31.12.2025 01:15 — 👍 0 🔁 0 💬 0 📌 0
A converted church building on a street corner, with bright organic/floral shapes on a saturated yellow background, contrasting with blue skies behind.
Social Good Place, a "co-working space for people working on social change", SE Portland Oregon
31.12.2025 00:20 — 👍 2 🔁 0 💬 1 📌 0...And when I get mad, you know that I open my big mouth. And then look out, 'cause when Josephine opens her mouth, they hear it all over the world ..."
26.12.2025 00:36 — 👍 2 🔁 0 💬 0 📌 0"I have walked into the palaces of kings and queens, and into the houses of presidents and much more. But I could not walk into a hotel in America and get a cup of coffee, and that made me mad.
...
Joséphine Baker s'exprimant à la tribune du Lincoln Memorial, parmi d'autres militants des droits civiques. Avant elle, Martin Luther King Junior a prononcé son discours "I have a dream". Elle porte des lunettes et son uniforme d'officier de l'armée de l'air française avec ses nombreuses décorations.
Joséphine Baker sur les marches du Lincoln Memorial. Elle porte des lunettes et son uniforme d'officier de l'armée de l'air française avec ses nombreuses décorations.
Joséphine Baker dans la foule réunie ce jour historique de 1963 devant le mémorial Lincoln. Elle porte des lunettes et son uniforme d'officier de l'armée de l'air française avec ses nombreuses décorations, parmi lesquelles la médaille de la Résistance, la Croix de guerre et la Légion d'honneur. Cette photo est en couleurs.
J'avais envie de vous montrer ces photos de Joséphine Baker à Washington en 1963.
25.12.2025 14:08 — 👍 250 🔁 66 💬 8 📌 3legitimately amazing
25.12.2025 15:37 — 👍 172 🔁 34 💬 13 📌 0
A largish rounded bolder in slow water, topped with patch moss. Late season Cottonwood trees hang on to some yellow leaves.
Upper Columbia Slough, Portland, Oregon
11.12.2025 21:58 — 👍 7 🔁 0 💬 0 📌 0
Orange path lights reflecting in spotted arcs off the slopes of the reservoir lining, with a water surface at left
Reservoir No. 5, Mt. Tabor Park, Portland Oregon
10.12.2025 06:24 — 👍 5 🔁 0 💬 0 📌 0This is U N B E L I E V A B L E. #Kilauea
06.12.2025 20:07 — 👍 1132 🔁 340 💬 36 📌 52
Sheep Grazing near Minnehaha Creek (1890s)
Source: Hennepin County Library.
