• 3 Posts
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Joined 11 months ago
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Cake day: June 5th, 2025

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  • Tap for spoiler

    I could’ve used a more thorough explanation that it was intended to be a one-way trip and that anyone going on the trip wasn’t going to want to go home anyway, because of the substantial risk that society mostly collapses by the time a human can travel back at an acceleration that their bodies could handle, and the time dilation increasing both the risk and aging off any loved ones they might have. That way it makes it clearer that Grace’s strongest emotional connection back home is his students, who will be very different people, if they’ve even survived, and it makes sense that he wants to go back to teaching.

    Although I’m also wondering about the pedagogy for teaching a species that doesn’t forget. The need to work through recall itself is less important, but it could be possible that teaching is more about training the problem solving and analytic skills using that body of knowledge.





  • 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.