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Joined 3 years ago
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Cake day: June 13th, 2023

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  • I’m a mech E in the medical field. We’re consistently understaffed. If I validate an Excel worksheet in Excel '08 or a Python program in 3.5 with a specific version of NumPy, we’re probably sticking with those versions for a while. Every time I bring up re-validating with the latest version, keeping one old system running the old software requires fewer resources than me or a colleague re-validating.

    My whole department is stuck on one version of Python because that was the most recent version when I had an emergency project and developed a data analysis algorithm. We validated it, then as new members were added to my team, they needed a copy, so we had to keep using it. I’ll probably re-validate it to the next Python release. It’s not only unit tests, or we could automate validation. Unit tests are a tiny part of validating software for making medical decisions. And software that directly runs a medical device (like firmware on an insulin pump) is an order of magnitude more rigorous than what I do.

    Side note: there are people who somehow root their insulin pumps and run algorithms on them. There’s a group that can get a PID control loop on an insulin pump that has a more simple control scheme on it (because that’s how the FDA approved it). The company has been trying to get approval to use PID control in the US for years.



  • There are methodical ways of valuating a private (and public) company. Some are pessimistic and some are wildly optimistic. Your can legally use whichever one you want, only you must only use that valuation method for everything. It’s illegal to value the company low for taxes and high for loan collateral. And if you sell it, you can owe back taxes if your valuation was off (sale price is the new valuation).

    This is overly-simplified US accounting rules (from finance class 10 years ago)



  • Seriously? I was looking at a Surface product recently, and it appeared to have an access panel for the NVME drive. I read a ton of complaints about the dimensions of the drive being unusual, but access to it was easy. I don’t think I was looking at a Surface pro though.

    If a surface pro wants to be a full OS and not a tablet OS, it should be easy to replace the storage device.









  • I do a lot of camping in bear country. I’ve been to Bannf. Bear spray is more effective than a firearm at stopping a brown bear attack. Bears have super sensitive noses and eyes, bear spray is immediate pain.

    Bears are extremely muscular from the front, so even if you could manage to shoot one several times from the front, you’d have to use non-expanding bullets like hard cast lead or full metal jacket, which aren’t as lethal as expanding bullets like flat nose or hollow points are (for people). Expanding bullets would be stopped by muscle in bears. Non-expanding bullets are slower at killing things (I believe it’s illegal to hunt with FMJ around me). Bears can run so quickly that a lethal shot killing a bear in two seconds might not be enough time to stop the bear before it could hurt you. And if a lethal shot took a minute to kill a bear, it’s not effective at stopping an attack.

    9mm has stopped brown bear attacks plenty of times, but it’s risky. Both US Parks Service and Parks Canada say bear spray is more effective at stopping a bear than a firearm. I think Parks Canada still uses 0.303 rifles to rangers, but that might be for polar bear. Canada is really strict on pepper spray and mace, but you can purchase bear spray, even if you’re not a citizen. I don’t think a non-citizen would be able to hike with a holstered 10mm or .40SW pistol anyways.

    Bannf was really crowded when I went there. It’s beautiful but the “must see” scenic spots are all filled with Instagrammers. Bears are probably less afraid of people, and I saw plenty of idiots 10 meters from a brown bear with an SLR camera without any precautions at all.

    Pro tip: Jasper is very similar terrain, is also a Canadian Park, and is much less crowded. When I was there a couple of years ago, there was zero cell signal an hour before we arrived at the park. You’ll need paper maps or offline GPS. If you want wilderness with fewer people, try Jasper Park.


  • Melting tundra releases methane, accelerating the increase in temperature. Rising temperature reduces polar ice, making oceans absorb more heat, accelerating heating. Climate pattern changes cause more frequent and larger wildfires, accelerating heating.

    There are probably processes that work to reduce heating as it increases that I’m not aware of, but there are a lot of positive feedback processes which is concerning.

    I believe the IPCC 1.5C was criticized because it included effects of a carbon sequestering process that hasn’t been invented yet. That’s pretty optimistic.