Dave Richeson
@divbyzero.bsky.social
Mathematician. John J. & Ann Curley Chair in Liberal Arts at Dickinson College. Author of Tales of Impossibility and Euler's Gem. Coffee drinker. [Everything in the timeline before October 2024 was imported from my Twitter/X feed 2008-24.]
You could count your books in base 6. Three cubes could get you up to 555 base 6, which is 6^3-1=215 base 10. 😂
November 13, 2025 at 3:01 AM
You could count your books in base 6. Three cubes could get you up to 555 base 6, which is 6^3-1=215 base 10. 😂
That's so funny. I misunderstood your joke. Gathering 4 Gardner is in SF next year, and I'm planning to do this activity there. When I saw your message, I thought, "I don't think I've told anyone that this is my plan...."
November 13, 2025 at 2:48 AM
That's so funny. I misunderstood your joke. Gathering 4 Gardner is in SF next year, and I'm planning to do this activity there. When I saw your message, I thought, "I don't think I've told anyone that this is my plan...."
Perhaps so! (But not to end up with a prime number)
November 11, 2025 at 11:07 PM
Perhaps so! (But not to end up with a prime number)
The more holes, the better. With a 36-spoke wheel, it would look like this. (Also, my method works best when there are a prime number of holes.)
November 11, 2025 at 8:17 PM
The more holes, the better. With a 36-spoke wheel, it would look like this. (Also, my method works best when there are a prime number of holes.)
Yes! I'm planning to share this. I'd like to write something up soon. I'll share it when I do. These are overlapping pieces of birch plywood glued together. It is still a little fragile, so I think a sandwich of thickness three would be better.
November 11, 2025 at 8:00 PM
Yes! I'm planning to share this. I'd like to write something up soon. I'll share it when I do. These are overlapping pieces of birch plywood glued together. It is still a little fragile, so I think a sandwich of thickness three would be better.
Reposted by Dave Richeson
I really enjoyed the Scientific American article on this experiment: bsky.app/profile/moti...
Guys will tell you they know a color then take you to a darkened room, make you bite down on a bar, and shine a laser in your eyes so it only stimulates M cones.
Five people—three researchers and two test subjects—have just seen a color no human has ever seen before.
November 11, 2025 at 5:33 PM
I really enjoyed the Scientific American article on this experiment: bsky.app/profile/moti...
I've only played for two days, so I can't say much about strategy, but the first two digits can be helpful for photos that look like they're from around 2000.
November 11, 2025 at 12:03 AM
I've only played for two days, so I can't say much about strategy, but the first two digits can be helpful for photos that look like they're from around 2000.
Aaaaaah! This just goes to show that I need not dash off messages in a rush. Mary Ellen Boole was married to Charles Howard Hinton. Her sister was Alicia Boole Stott. She coined the term polytope.
November 9, 2025 at 6:53 PM
Aaaaaah! This just goes to show that I need not dash off messages in a rush. Mary Ellen Boole was married to Charles Howard Hinton. Her sister was Alicia Boole Stott. She coined the term polytope.
Ah, I didn't read this carefully enough. Mary Everest Boole, not Mary Ellen Boole. I confused the mother and the daughter.
November 9, 2025 at 6:24 PM
Ah, I didn't read this carefully enough. Mary Everest Boole, not Mary Ellen Boole. I confused the mother and the daughter.
Ah, I didn't read this carefully enough. Mary Everest Boole, not Mary Ellen Boole. I confused the mother and the daughter.
November 9, 2025 at 6:23 PM
Ah, I didn't read this carefully enough. Mary Everest Boole, not Mary Ellen Boole. I confused the mother and the daughter.
The inspiration for this approach was George Hart's string art activities: makingmathvisible.com/String-Rings...
Rings and Strings
makingmathvisible.com
November 9, 2025 at 4:39 PM
The inspiration for this approach was George Hart's string art activities: makingmathvisible.com/String-Rings...
Congratulations! Looks great!
November 6, 2025 at 12:56 PM
Congratulations! Looks great!