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Joined 2 年前
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Cake day: 2024年2月28日

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  • I dug up the actual paper (Cook, 2004) and it turns out the bicycle was symmetrical… and, in fact, entirely virtual.

    The virtual bicycle used for simulation

    It’s a plot of a computer simulation, rather than records from a real-world physical experiment.

    A bicycle is composed of four rigid bodies: the two wheels, the frame, the front fork (the steering column). Each adjacent pair of parts is connected with a joint that allows rotation along a defined axis, and the wheels are connected to the ground by requiring that their lowest point must have zero height and no horizontal motion (no sliding).

    So the simulation has a lot of simplifications from reality, and the picture tells us more about the simulation model than it tells us about the real world. It is a pretty picture, though.

    Here’s the paper reference:

    Cook, M. 2004. It takes two neurons to ride a bicycle.

    (I couldn’t get it from the Cook’s Caltech site, but I found a copy elsewhere.)





  • It sounds more like you want to create a new community on an existing instance.

    Setting up a new community can be as easy as clicking the new community button and filling in the fields.

    Setting up a whole instance of Lemmy (like lemmy.world, which you’re on, or aussie.zone, which I’m on) is way more involved than you’re probably thinking - buying a domain name, figuring out hosting, installing the Lemmy software, and a whole lot more.






  • I like using word association as a game. It’s quick to learn, doesn’t need any equipment, and it’s no problem to join or leave the table whenever you like.

    Try to get from some word (eg HOME) to some other word (eg SUMMIT) taking only small, obvious steps.

    Each step should make a pair of terms that “obviously” fit together. They can fit together because they sound similar (HOME -> ROAM), or they are written similarly (HOME -> HOLE), or have an obviously-related meaning (HOME -> AWAY)… anything that makes sense to the group.

    You can take turns around a circle. When it’s your turn, you announce the next link. If anyone thinks the link isn’t small enough or obvious enough, they can object and you’ll need to pick a different link. Then it’s the next person’s turn.

    You can play competitively if you like (the person to reach the target word wins) but it also works fine without announcing a winner.











  • I don’t know how NaytaData made it, but if I were doing it, I would do something like this:

    • start with a “blank” un-coloured map of coastline and country borders
    • put all the “capital” cities on the map
    • make a temporary grid of points over the map and find the closest city for each point
    • paint the map based on those temporary grid points

    I would use a computer but the same steps would work with paper & pen.