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Joined 3 years ago
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Cake day: June 11th, 2023

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  • Assignments are not evidence of learning. Assignments are pressure for students to learn. They are motivation to spend time acquiring knowledge and practicing skills expected to be acquired from the class.

    For students who master this knowledge and skill without that pressure, assignments are distractions from further study. They force the student to expend time and energy on previously-mastered material, rather than allowing them to focus on unmastered subjects or additional classes.

    If I were building a grading rubric, I would say that the test score at the end of each unit is the minimum score recorded for any assignment in that unit. My tests would be killers: I would target 80% raw scores, but final test scores would be on a curve, with the median score being recorded as an “A”.

    Score a 100% raw score on a unit test, and every assignment for that unit is raised to 100%. The student has demonstrated complete mastery of the subject matter; any grade less than 100% does not reflect their true capability.

    Score an 80% raw score on the unit test, and every assignment for that unit is at least an 80%. A 95% assignment stays a 95%, but a 45% assignment is counted as 80%. Missing assignments are counted as 80%, not 0%.

    I would go further: the raw score on the final exam replaces every lower grade in the grade book. You ace that indomitable horror of a final exam, you ace the class, regardless of how much effort you put in.


  • The purpose of a class is to instill a specific set of knowledge and skills.

    The purpose of an assignment is to provide the student with sufficient pressure to study the expected knowledge, and practice the expected skills. The assignment is the pressure to learn; it is not evidence of learning.

    To the student who has achieved mastery of that knowledge and skillset prior to completing the class, an assignment has no valid purpose. For such a student, the assignment is busywork, and serves only to distract the student from further study.

    If your grading style does not allow for a student to demonstrate mastery and refuse busywork assignments, your grading is a problem.

    A student with test scores equal or better than the class average does not deserve to fail your class for having refused assignments.

    A student who ritualistically completes all of their homework assignments with excellent marks, but is entirely unable to pass a test on the subject matter, is a student who has failed your class.


  • There is a difference between providing the capability, and requiring that capability.

    Under this law, something as simple as sharing a Google Drive could make you an “app store” and potentially liable for penalties.

    These laws are specifically designed to be broadly interpreted. We have no idea just how widely the nets will be cast, either tomorrow, or 10 years from now. It is prudent to assume the absolute worst case.









  • RS232? RS485? RS422? Not that I know much difference between them, but just to satisfy my own curiosity…

    My experience with ground loops is primarily from audio equipment. The last one I remember was probably 20 years ago. I had two different devices were plugged into two different outlets on opposite ends of the room. One was either a TV or a computer, providing an analog audio signal to a stereo system. Every time I connected the coaxial audio cable, I got a horribly loud 60hz hum. The ground potential of the two systems were slightly different, and the difference was being carried across the shield of the coaxial cable. The amplifier was boosting that difference, and the result was the overpowering hum.

    In my case, the workaround was to snip the ground prong on the amplifier and let it float. I generally wouldn’t recommend that.

    I kinda doubt you have anything plugged into that port when you’re working on it in your shop. Definitely have them try disconnecting everything plugged into that port and see if the problem goes away.

    Are both the motor controller power supply and the computer plugged into the same outlet? If not, get an extension cord and try that.



  • I’m actually wondering how payouts for poly market works I’d assume it would be proportional to how much you bet versus everyone else. Probably whole range.

    https://docs.polymarket.com/concepts/positions-tokens

    When someone starts an event, there are initially no shares to be had. You can pay $1 and buy both a “yes” share and a “no” share from Polymarket. This is called “splitting”. You’re splitting your money into shares on both sides of the event.

    Presumably, you want something more than breaking even. So, you keep the side of the bet that you want, and you offer to sell the other side of that bet.

    You could offer your “no” shares for $0.25 each. Someone can give you $25 for them. Now you have 100 “yes” shares that will be worth $100 or $0 in the future, and $25 cash. You could offer your “yes” shares for $0.80 each. Someone else might buy them from you at that price, giving you $80. You are now out of the market, with a total of $105 back. This is “trading”.

    After a hard day of trading back and forth, you find yourself with good positions on both sides of the bet. You have 200 “yes” shares that you paid $80 for, and 100 “no” shares that you also paid $40 for. You can take 100 yes shares and 100 no shares, join them together, and sell them back to Polymarket for $100. This is called “merging”.

    Finally, you can wait until the event occurs. Let’s say the outcome was “yes”. Your 100 “yes” shares are now worth $1 each, and can now be traded at that price. This is called “redeeming”.




  • To be viable, a solution is going to have to include replacement for the functions provided by fossil fuels. Without those functions, we’re back in the stone age. Scientists might tolerate that, but the general public will not. Electric cars and electrified trains will solve a large part of that problem, but sea and air transport aren’t anywhere close.

    Synthetic gaseous and liquid fuels and lubricants can be produced using atmospheric CO2 as a feedstock. The problem is that the process is energy intensive. But, that very problem is also a solution to another one.

    Solar and wind electrical generation has a massive problem with seasonal variability. We can solve the daily variability with various storage methods, but there is no viable way for storage to manage seasonal variation. Basically, a solar panel that is sized to meet our needs in the short days of low-angle sunlight we get in winter will produce more than three times as much energy as we need under long, high-angle sunlight in summer.

    Excess production reduces the profitability of every generator on the grid. So we get to a situation where profits are maximized long before we meet our generation needs. Any further increase in generation capacity decreases expected revenues. We are motivated to reduce solar generation capacity before our needs are fully met, rather than increasing it to fully meet our needs. This is the real problem currently coming over the horizon; the one we need to begin addressing.

    We can frame this as a problem of variation in supply. Or we can reframe it as a problem with lack of variation in demand. The latter is a much simpler problem to solve. The problem isn’t that we produce too much power in the summer. The problem is that we use too much power in the winter, but not nearly enough in the summer. We need to decrease our winter consumption, and increase our summer consumption to match what we produce.

    If we soak up the excess energy in spring, summer, and autumn to produce synthetic fuel and lubricants from atmospheric CO2, we keep renewable generation profitable year round, while also producing a carbon-neutral replacement for petroleum oil.

    (This is not a theoretical: the Air Force has certified all of its aircraft to operate on Fisher-Tropsch-produced synfuels. These fuels are direct replacements for petroleum fuels, but are developed from catylizing CO2 and hydrogen into long-chained hydrocarbons, rather than refining from petroleum.)


  • Backing out of a parking space, you must yield to traffic within the lane of traffic However, you are on the wrong end of the vehicle to properly observe traffic within the lane. With restricted vision and attention focused on the maneuver, you are also burdened with deconflicting traffic that has the right-of-way over you.

    Backing in, you begin the maneuver from a lane in which you are already established. You have the right-of-way over that lane until you have completely departed that lane. While you are distracted and focused on the backing maneuver, conflicting traffic is legally obligated to avoid you.

    “Backing in” exploits “right-of-way” to improve safety for both you and your fellow travelers.



  • Comment refers to the girl’s eyeglass prescription, not a ranking of her attractiveness.

    Based on the distortion visible in her glasses, her prescription is approximately -1.00 to -1.50 diopters. Severely nearsighted prescriptions would cause the wearer to appear to have much smaller eyes; farsighted prescription would cause the eyes to appear larger.