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Cake day: June 10th, 2023

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  • The solar sail reflects light instead of absorbing it so you get to double dip on photon momentum.

    And sure, you can steer with the laser I suppose, but with that kind of super weak deltaV, you’re not going to be exactly doing donuts in the solar system.

    Even the massive solar sail only imparts a super small amount of force. It’s only useful because it does so for free over a long period of time with no air resistance.

    You’d be better off using a conventional thruster to do whatever steering you needed to do before letting the sail take over. It’s not like you need to steer around any obstacles.



  • I ditched my smartphone spring of 2023. Still use it on WiFi at home, but every time I leave the house, I only carry a fliphone.

    Every time a stranger asks me about it, they say something like “I wish I could ditch my smartphone.” Like I get it. It’s not easy. I can’t even go to a baseball game unless my wife has our tickets on her phone. Paying for parking sometimes requires an app.

    Yet apparently everyone hates this thing that they are now required to carry around.

    How did we get here?









  • We have the South Lake Union Railcar in Seattle. Nobody rides it. And like I’m not one to blame infrastructure, but you can literally walk faster than it moves. Meanwhile there are shitloads of buses with plenty of ridership. Many fully electric with overhead wire.

    Meanwhile bicyclists routinely get their wheels caught in the tracks and eat it.

    I can’t imagine the efficiency of rail makes much difference in a city environment. The best argument I’ve heard for rail is that it’s more a commitment to developers that the route won’t be changed any time soon.