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Joined 10 months ago
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Cake day: June 5th, 2025

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  • increased fuel consumption of spinning down and then spinning back up

    wastes a tremendous amount of fuel to spin down/up again

    I think a flywheel mechanical energy storage system could both serve as a way to store energy and as a way to manipulate the rotation while preserving rotational energy. To slow down the rotation, transfer the rotational energy to a flywheel, and then transfer it back when you need to go back to speed. That adds some mechanical complexity but it creates a more efficient way to control rotation. Plus with electric motors and solar panels, that should be possible to manage without using any propellant fuel.



  • Maybe other intelligent life forms don’t make the same assumptions that we do that lead to the statement that there are two “apples,” and maybe mathematics isn’t universal.

    That just shows that “Apple” isn’t necessarily universal, and doesn’t actually disprove the universality of the concept of “two.”

    There are a ton of different physical ways to represent the Fibonacci sequence, for example, and I would imagine the first contact looks for ways to find the mutually understood medium by both sides: raised symbols, pulses of radiation, pulses of vibrations, physical pebbles arranged in a line, physical pebbles manipulated over a timeline, etc.

    Once we establish a common medium, we’d explore mutual understanding of prime numbers, approximations of pi/e/phi, and things like that.










  • Back in the day you called a repairman.

    That guy’s time is worth probably $30/hour, so if you want to use up his 8 hour day you’d better be willing to pay $240, plus parts, plus the gas money of driving his truck to your home, plus the cost of keeping those parts on hand and the truck available.

    Or if it’s something he knows is only a half day job, then he can book something else so that he only really needs to charge you $120.

    Now that a lot of these appliances are like $500, it’s pretty hard to justify the cost of professional repair.

    50 years ago, when the price of an appliance was something like 50 hours of a repairman’s hourly wage, it made a lot of sense for most issues to be fixed by a professional. Now that these appliances are worth like 15-20 worker hours, it’s much harder to justify.








  • Most of the stuff in this thread

    We probably need to talk about what one’s definition of “rich” is. I suspect the commenters in this thread are all over the place.

    When I was growing up, my idea of rich was private schools and McMansions and overseas vacations and new BMWs for 16th birthdays, basically the kind of lifestyle accessible to only the top 5%.

    But now, 20+ years later, I’ve been around 0.1%ers, desensitized to upper middle class stuff that the things I used to believe were signifiers of wealth barely register for me anymore. I’ve also been around descendants of former 0.1%ers who carry some cultural baggage from their families despite having “only” ordinary upper middle class income.

    I read this thread and wonder where each commenter sits in how they evaluate richness.



  • There are all sorts of filters:

    • Expensive clubs. Members only associations like country clubs can skew towards the ultra rich. Yacht clubs and polo clubs are kinda an extreme version of this, but there are all sorts of organizations where the membership can be assumed to be rich.
    • Expensive hobbies. Wine tasting, skiing, golfing, boating, horse stuff, biking, and traveling/vacations can range from the slightly expensive to prices that only the ultra rich can afford.
    • Related to both of the above, expensive places. If you’re skiing in an expensive resort town, and hanging out in the lobby of a $2000/night hotel, you’ll probably only see employees of these places or other very rich people. Some have even layers beyond that, like an exclusive members only club in an expensive area, or a separate lounge for only people lodging in the most expensive rooms in the hotel. Or if you’re at a private jet airport, and weather causes delays and cancellations, standing around in the terminal might allow you to mingle with other private jet people. Or if you live in a crazy expensive neighborhood or building, your neighbors are pretty much guaranteed to be rich.
    • Third party verification. Networking, introduction by mutual friends/acquaintances, even social media or dating apps where you have to prove your status/wealth.

    It’s not all or nothing, either. Some places have a disproportionately high number of rich people but aren’t necessarily exclusive to the rich (private schools, certain types of clubs, certain types of activities/hobbies, public parks/restaurants/libraries/museums in rich areas). So a lot of rich people do mingle with the middle class, but often will feel comfortable letting their guard down more or less in particular places or in particular groups.