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Cake day: June 16th, 2023

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  • I think it doesn’t go far enough. Straight up, no one should be permitted to create or transmit the likeness of anyone [prior to, say, 20 years following their death] without their explicit, written permission. Make the fine $1,000,000 or 10% of the offender’s net worth, whichever is greater; same penalty and corporate revocation for any corporation involved. Everyone involved from the prompt writer to the work-for-hire people should be liable for the full penalty. I can’t think of a valid, non-entertainment (parody/humor), reason for non-consensual impersonation - and using it for humor or parody is a slippery slope to propaganda weaponization. There is no baby in this tub of bathwater.


  • Based on videos from one of the major lava-themed entertainment venues who has been posting updates for two months, the “barriers” for Grindavik were barely started, with work only beginning some time after January 4th or 5th. The primary focus of the public work was in building the barriers to protect the regional power plant to the east of the fissures (and hot springs resort area just east and north the power plant). IIRC, those barriers took a month to construct.

    The subsurface dam/inclusion runs pretty much directly under Grindavik, so if an active eruption opens along the southern edge of the magma inclusion there will be no way to prevent damage to those houses adjacent.

    Disc: I’m neither a seismologist nor a volcanologist, but I’ve seen Journey to the Center of the Earth. Oh, and I was in Grindavik in October.





  • From a technical perspective, this is why a colder than average winter will affect (air-source) electric heat pumps more than resistance or fuel sourced heat. As the outside temps go down, the efficiency decreases in a heat pump, so the curve is non-linear. For electric resistance and fuels, the outdoor temperature has a near zero effect, making the increase in cost linear.

    Not that it matters too much. Electricity costs in most of the US are relatively stable whereas fuel costs can swing by a factor of five or more from year to year ($2/MMBTU to over $12/MMBTU in the last decade). Oil doesn’t play much into heating anymore, but it can also swing by more than a factor of two (From a low of $2/gal to over $5/gal in the last decade). Electric, though, is up by 25% over the last decade (on average) and varies by less than a a couple percent from year to year, slowly increasing at around a 2% average rate.





  • Interesting that I learned 32.2 ft/s, but only 9.8 m/s - one less significant figure, but only a factor of two in precision (32.2 vs 32 = .6%; 9.81 vs 9.8 is only 0.1%). Here’s the fun part - as a practicing engineer for three decades, both in aerospace and in industry, it’s exceedingly rare that precision of 0.1% will lead to a better result. Now, people doing physics and high-accuracy detection based on physical parameters really do use that kind of precision and it matters. But for almost every physical object and mechanism in ordinary life, refining to better than 1% is almost always wasted effort.

    Being off by 10/9.81x is usually less than the amount that non-modeled conditions will affect the design of a component. Thermal changes, bolt tensions, humidity, temperature, material imperfections, and input variance all conspire to invalidate my careful calculations. Finding the answer to 4 decimal places is nice, but being about to get an answer within 5% or so in your head, quickly, and on site where a solution is needed quickly makes you look like a genius.



  • Yeah, that’s just a shitty (or out of spec) time base. My Seiko watch gains 1-2 minutes a day, but it’s completely mechanical so it depends on temperature and winding/mechanism tension for accuracy. There are electronic timing circuits which are resistance and capacity based, and as the resistance and capacitance of the system drift (time/age and temperature) they also drift. A crystal, made to vibrate at high frequency (piezoelectrically, iirc), will provide a much more stable time base and be accurate to seconds over many days’ time.

    Interesting aside - time keeping is how ships at sea used to determine where they were in the ocean. Latitude can be found from the stars, but longitude can’t so it needs a time reference standard. The book, Longitude tells the story of the search and the competing methods for determining location prior to the invention of crystal/electronic time bases and modern GPS. I won’t say that the storytelling is particularly gripping, but the actual path to discovery is fascinating.


  • That’s probably just fluctuations in the line frequency and the method for keeping time varying between the two (one might use a crystal that drifts). Being on the “wrong” frequency will have it shift by hours every day. I had a (US/60Hz origin) microwave in my apartment in Bonaire (50Hz) last year that never seemed to have the right time, and when I did the math I realized it was the frequency - it was behind by ~4 extra hours every day (50/60 x 24 hours).