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ljsprague commented on Thousands of U.S. farmers have Parkinson's. They blame a deadly pesticide   mlive.com/news/2025/12/th... · Posted by u/bikenaga
peppersghost93 · 3 days ago
"If you make any other assumption than "I don't know what's happening here and need to learn more" you'll constantly be making these kind of errors. You don't have to have an opinion on every topic."

I can do this and still start off by assuming the corporation is in the wrong. The tendency to optimize for profits at the expense of everything else, to ignore all negative externalities is inherent to all American corporations.

ljsprague · 2 days ago
Many individuals optimize for profits too.
ljsprague commented on Covid in pregnancy raises child's risk for developmental disorders   news.harvard.edu/gazette/... · Posted by u/hn_acker
ljsprague · 22 days ago
Are they still doing gain-of-function research on viruses?
ljsprague commented on A Fast 64-Bit Date Algorithm (30–40% faster by counting dates backwards)   benjoffe.com/fast-date-64... · Posted by u/benjoffe
variaga · 22 days ago
That's correct, the Romans had March as the first month of the year, so leap day was the last day of the year and September, October, November and December were the 7th (sept), 8th (oct), ninth (nov) and 10th (dec) months.
ljsprague · 22 days ago
June and July used to be Quintilis and Sextilis.
ljsprague commented on A 1961 Relay Computer Running in the Browser   minivac.greg.technology/... · Posted by u/vaibhavsagar
ljsprague · a month ago
I imagine it would be easier for me to build the simulator than to make it do anything of interest.
ljsprague commented on Realtime BART Arrival Display   filbot.com/real-time-bart... · Posted by u/Jadrago
ljsprague · a month ago
How are you hiding the cable in the last photo or is it battery powered?
ljsprague commented on Marble Fountain   willmorrison.net/posts/ma... · Posted by u/chris_overseas
ljsprague · a month ago
Why isn't the top-down footprint a square?
ljsprague commented on Marble Fountain   willmorrison.net/posts/ma... · Posted by u/chris_overseas
kazinator · a month ago
Designers of marble fountains who don't use computing to design the paths run into reliability issues: sometimes balls derailing out of their track. They have to observe the contraption, identify problems (balls getting jammed up or jumping out) and then guess at the root causes and make manual adjustments.

That's the thing here: he has it running for hours presumably without any ball jumping out.

Most of the tracks consist of two rails, so the ball has two contact points. I'm no physicist but it seems like the goal would be to have ideally nearly equal forces at the two contact points at all times during the ball's descent. In other words, the track has to be perfectly banked so that the gravity and centripetal acceleration vector are balanced by a normal vector perpendicular to the rails. During a derailment, the ball has to lift away from one of the two contact points, so the normal force must have dropped to zero.

ljsprague · a month ago
My naïve guess would be that you can't change the route of the ball without asymmetrical track pressure.
ljsprague commented on Marble Fountain   willmorrison.net/posts/ma... · Posted by u/chris_overseas
ljsprague · a month ago
Gorgeous!

Dead Comment

ljsprague commented on How to create an OS from scratch   github.com/cfenollosa/os-... · Posted by u/pykello
ljsprague · 3 months ago
I still don't understand what's "running" the boot sector.

u/ljsprague

KarmaCake day71September 11, 2023View Original