Don De Tina
@donnyd.bsky.social
MD. Work-retired. Neurodivergent. Life hobbyist.
Grateful husband to MaryLou and dad to Greg & Alicia.
Alicia died by suicide in 2014, at age 27💔. Grief is love.
(search my feed with #🔖 for my bookmarks)
📍Hamilton, Canada
Grateful husband to MaryLou and dad to Greg & Alicia.
Alicia died by suicide in 2014, at age 27💔. Grief is love.
(search my feed with #🔖 for my bookmarks)
📍Hamilton, Canada
wip: 'Rose of Venus' curve via p5js. If you drew lines between the positions of Earth and Venus, after a while, the curve would look something like this. Earth orbits the sun about 8 times, for every 13 orbits of Venus.
November 19, 2025 at 5:02 PM
wip: 'Rose of Venus' curve via p5js. If you drew lines between the positions of Earth and Venus, after a while, the curve would look something like this. Earth orbits the sun about 8 times, for every 13 orbits of Venus.
Walked to Felker’s Falls with my brother, sister and in-laws. Down to a trickle, but easy to see this time of year.
November 18, 2025 at 9:17 PM
Walked to Felker’s Falls with my brother, sister and in-laws. Down to a trickle, but easy to see this time of year.
having some fun with my daily chore of cleaning reusable coffee pods
November 17, 2025 at 2:44 PM
having some fun with my daily chore of cleaning reusable coffee pods
Sorry to hear of this. Stan Collins was a kind and generous man. Countless artists have used and still use his beautiful public domain photographs of Newfoundland as creative references. Thank you Stan.
November 8, 2025 at 3:06 PM
Sorry to hear of this. Stan Collins was a kind and generous man. Countless artists have used and still use his beautiful public domain photographs of Newfoundland as creative references. Thank you Stan.
If you see this, post a vampire that isn’t Dracula.
October 30, 2025 at 2:05 PM
If you see this, post a vampire that isn’t Dracula.
Tourism Hamilton markets us as the City of Waterfalls. We have the Niagara Escarpment to thank. What I didn't know is that the escarpment ranges all the way from Western New York, through to Manitoulin Island, Michigan & Wisconsin. It's a remnant of glacial erosion. en.wikipedia.org/wiki/Niagara...
October 23, 2025 at 10:29 PM
Tourism Hamilton markets us as the City of Waterfalls. We have the Niagara Escarpment to thank. What I didn't know is that the escarpment ranges all the way from Western New York, through to Manitoulin Island, Michigan & Wisconsin. It's a remnant of glacial erosion. en.wikipedia.org/wiki/Niagara...
When I showed our makerspace librarian a cardioid last night, he told me he'd encountered the term in acoustics with respect to microphones. Another example, optical caustics are found naturally in coffee cups. The latter can also be simulated by 3d rendering engines.
![The apple-shaped revolved cardioid similar to that of cardioid microphones. (RevolutionPlot3D[{x[t], y[t]}, {t, 0, \[Pi]},
PlotStyle -> Directive[RGBColor[1., 0.77, 0.38], Opacity[0.582]],
RevolutionAxis -> x])](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:7x45zen245qcoy6735frf4rc/bafkreiaplpkztatqli5edv2tvteo2prd5djbgwgv7gaf5s5l3gdqtlqct4@jpeg)
October 17, 2025 at 3:25 PM
When I showed our makerspace librarian a cardioid last night, he told me he'd encountered the term in acoustics with respect to microphones. Another example, optical caustics are found naturally in coffee cups. The latter can also be simulated by 3d rendering engines.
My son's recent birthday gift. He picked it out himself, and I told him it reminds me of one of the ships from Space Invaders!
October 5, 2025 at 8:47 PM
My son's recent birthday gift. He picked it out himself, and I told him it reminds me of one of the ships from Space Invaders!
anonymous, good and true
October 4, 2025 at 6:21 PM
anonymous, good and true
Illustration of two "miracle" symmetries which are both non-gyrational and non-reflective.
Credit:
Conway; Burgiel; Goodman-Strauss. "The Magic Theorem: A Greatly-Expanded, Much-Abridged Edition of The Symmetries of Things" (AK Peters/CRC Recreational Mathematics Series)
Credit:
Conway; Burgiel; Goodman-Strauss. "The Magic Theorem: A Greatly-Expanded, Much-Abridged Edition of The Symmetries of Things" (AK Peters/CRC Recreational Mathematics Series)
September 29, 2025 at 2:00 PM
Illustration of two "miracle" symmetries which are both non-gyrational and non-reflective.
Credit:
Conway; Burgiel; Goodman-Strauss. "The Magic Theorem: A Greatly-Expanded, Much-Abridged Edition of The Symmetries of Things" (AK Peters/CRC Recreational Mathematics Series)
Credit:
Conway; Burgiel; Goodman-Strauss. "The Magic Theorem: A Greatly-Expanded, Much-Abridged Edition of The Symmetries of Things" (AK Peters/CRC Recreational Mathematics Series)
When there's a large cat bed, and a small one that's always the one both cats are trying to share.
September 28, 2025 at 1:24 AM
When there's a large cat bed, and a small one that's always the one both cats are trying to share.
"Hard" evidence that acetaminophen doesn't cause autism.
September 23, 2025 at 2:53 PM
"Hard" evidence that acetaminophen doesn't cause autism.
Dr. Tyler Black is right.
September 22, 2025 at 5:43 PM
Dr. Tyler Black is right.
Though, at first glance, presenting as a deck-building roguelike, Inscryption combines with it so many other genres as to become almost genreless. This, from Wikipedia, contains some spoilers.
September 12, 2025 at 6:15 PM
Though, at first glance, presenting as a deck-building roguelike, Inscryption combines with it so many other genres as to become almost genreless. This, from Wikipedia, contains some spoilers.
Our permanent hallway memory table. On Alicia's Birthday today, another photo added by Mary Lou.
August 21, 2025 at 10:40 PM
Our permanent hallway memory table. On Alicia's Birthday today, another photo added by Mary Lou.
This little bit of life seems to be taking a respite from the smoke outside. It has a wingspan of less than my thumbnail.
The Leafroller Moth. Reference: inaturalist.ca/taxa/1106113...
The Leafroller Moth. Reference: inaturalist.ca/taxa/1106113...
August 5, 2025 at 12:10 PM
This little bit of life seems to be taking a respite from the smoke outside. It has a wingspan of less than my thumbnail.
The Leafroller Moth. Reference: inaturalist.ca/taxa/1106113...
The Leafroller Moth. Reference: inaturalist.ca/taxa/1106113...
A lot happening. My wife is recovering from 2 dental implants under anesthesia. I had to go to the emergency with a possible retinal detachment that turned out to be just a benign vitreous detachment, and we met some great guys that'll be demolishing our rotting cantilever balcony pictured here.💪
August 2, 2025 at 3:21 PM
A lot happening. My wife is recovering from 2 dental implants under anesthesia. I had to go to the emergency with a possible retinal detachment that turned out to be just a benign vitreous detachment, and we met some great guys that'll be demolishing our rotting cantilever balcony pictured here.💪
glass geodesic on a copper base plane; rhino renderer
July 19, 2025 at 3:20 PM
glass geodesic on a copper base plane; rhino renderer
This is 301,030 digits long. (context: working my way through the very good book "JavaScript: The Definitive Guide" by David Flanagan)
July 17, 2025 at 2:46 PM
This is 301,030 digits long. (context: working my way through the very good book "JavaScript: The Definitive Guide" by David Flanagan)
Random post. Impressive BigInt performance running Node.js to calculate 2 to the power of one million. Runtime 0.243 seconds on my MacBook Air M2. Safari console doesn't yet support BigInt yet, but most other browsers do.
July 17, 2025 at 12:08 AM
Random post. Impressive BigInt performance running Node.js to calculate 2 to the power of one million. Runtime 0.243 seconds on my MacBook Air M2. Safari console doesn't yet support BigInt yet, but most other browsers do.
Hydra video processor with voronoi source. This is then sent through colorama and kaleidoscopic filters. Output is then captured with OBS Studio.
July 8, 2025 at 7:22 PM
Hydra video processor with voronoi source. This is then sent through colorama and kaleidoscopic filters. Output is then captured with OBS Studio.