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3
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1,198
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2 yr. ago

  • I was curious, so I looked it up and it seems that around 3KB is the max for a single 177x177 code (though I imagine this is a "soft" limit?). With 600DPI being common for laser printers, a DPI-limited 3KB would be well under 1cm x 1cm. My hunch is that this wouldn't be super reliable (DPI limit not necessarily the resolution of the printer?), but I'd be curious to see what the usable QR density actually is. But yeah...a few QR codes should do the trick!

  • A perk of belonging to my city's bike advocacy group is that you can rent this for no additional charge:

    64″ aluminum truss-frame trailer; easily carry a 4×8 sheet of plywood, eight bags of groceries, or whatever else you can fit on it up to 300 lbs; holds 4 plastic tote boxes before stacking

    Nosireebob, can't haul stuff around with that... /s

  • Googling around, you get about 1e11 kJ/gram of He produced (source.

    Wikipedia says Hindenburg volume is 200,000 m cubed . Multiply by density of He at stp and you get north of 1e7 grams.

    Multiply and you get 1e21 J. Estimate for worldwide energy consumption in 2010, from Wolfram Alpha, is half of that.

    So, if all energy were from local fusion, it would take about two years of production to fill a single Hindenburg-sized Zeppelin. That is a huge amount of energy.

    I don't think it's equivalent to compare energy with RAM like this. Energy is the realm of thermodynamics; things like boiling water don't care about technology, they just need a certain amount of energy. Unless we're talking about fundamentally new uses of energy, like floating cities or something whacky, I think the amount of energy here is really, really big.

  • I would be surprised if you couldn't get 8KB for 200 years out of standard flash simply by extreme duplication --- 8GB/8KB means a million copies on one (very small by today's standards!) drive.

    Or is the failure mechanism something other than bitrot?

  • I'm too lazy to work through the numbers but I think helium production would be very small --- which is another way of saying fusion (as envisioned for energy use) produces a huge amount of energy.

  • Yeah, tenure definitely a double-edged sword. On the one hand, being able to voice potentially unpopular opinions is important. On the other, having dead weight occupying faculty positions which brilliant younger folk would kill for --- folks who would be more productive, more engaged, and contribute more to the world --- is...well, maybe not great.

  • I mean, what should we be optimizing for here? Is it better to have a sparsely populated, sprawling suburb state? Or is it better to have high density areas (e.g., the Bay Area) with surrounding open space (CA has a lot of pristine & protected wilderness)? CA obviously has both high density areas and some sprawl; but I'm guessing that pollution generated per capita is better in a place like the bay area than in more rural parts of the country on account of being able to walk, bike, or take public transportation places.

    Also, as others pointed out, wildfires --- not sure how these numbers are generated, but if it's just a simple average than it doesn't capture the health consequences I'm guessing: during wildfires, it's not uncommon to wear an N95 outside, and basically avoid outside if possible (and certainly no exercise outdoors).

  • You may want to check local regulations --- if there's a legal requirement to delete the data, I'd try to take advantage of that.

    On a related note, I cannot recommend Immich enough! I had previously used other self hosted solutions but Immich is just fantastic --- great desktop and mobile, awesome locally run ML, great shared link support, an overall awesome experience. (I'm not affiliated at all. Bit of a "gateway drug" to self hosting...)

  • During one journal club-style group meeting, our PI was tearing into a paper and basically calling it bullshit. We had a highschool intern in the group, and he turned to me and said, "but it's peer reviewed...how can it be wrong?"

  • I kinda prefer xargs to the -exec option --- just feels more UNIXy to me (do one one job well).

    But as another comment said, for grep I just use -r and --include. So clearly I'm not very consistent...