keep your children safe
rcbrk @ rcbrk @lemmy.ml Posts 23Comments 181Joined 4 yr. ago
rcbrk @ rcbrk @lemmy.ml
Posts
23
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181
Joined
4 yr. ago
Sure, an individual can prevent their own devices collecting data about them, but the paper is about all the devices surrounding a person in other people's pockets/homes/workplaces: collecting data on -- recording -- that individual.
[...] The researchers discovered that even if individual users turned off data tracking and didn’t share their own information, their mobility patterns could still be predicted with surprising accuracy based on data collected from their acquaintances.
“Worse,” says Ghoshal, “almost as much latent information can be extracted from perfect strangers that the individual tends to co-locate with.”
In many (most?) jurisdictions it is illegal to make a recording of a conversation either which you are not party to, or without consent of all parties involved; sometimes with consideration towards whether there was reasonable expectation that the conversation be private. Even when legal, there are often restrictions on how that recording can be used.
The laws aren't always written specific to audio/video recording (not that always-recording by google/apple/amazon/etc isn't a problem already..) -- how does such surveillance figure in to existing legislation around the world?
So.. I really don't know chemistry, and these aren't the highest quality references, but here goes:
- 4 mol of iron in a heat pack provides 1648.4 kJ of heat. [1]
- 4 mol of iron weighs 223g. [2]
- Recycling 1000kg of steel saves 642 kWh of energy. [3]
- Recycling 0.223kg steel saves 642 * 0.223 / 1000 = ~ 0.143 kWh
- 0.143 * 3600 = 515 kJ
Huh. So maybe heat packs are a reasonable use of scrap iron's embodied energy after all. Assuming you have a sufficient source of uncontaminated steel filing waste and that it's economical to collect and process into heat packs.
...But only if you're heating your water using fossil fuels using an inefficient method! If your water is heated using solar or waste heat capture or a heat pump[4], which would swing the balance way over to hot water bottles again.
You're not considering the energy required to smelt the iron.
Iron filings (in a collected quantity high enough to make manufacturing these heat packs worthwhile) are not a waste product, they are recycled -- saving the smelting of that much new iron.
Sawdust+iron heat packs are a very useful and non-hazardous product, for sure, but aside from situations where a hot water bottle is impractical, hot water bottle still wins.
I think Assange is a legendary journalist who (to put it mildly) is bearing the brunt of a fucked up assault on the free press by CIA/etc.
Nothing at all! If anything I mentioned it as a point of approval from me, and stating them to clearly not be in the same camp as the banned-from-twitter-because-right-wing-extremists.
I don't think it's that kind of banned from twitter. The figures behind it seem to associate themselves with Wikileaks and/or Julian Assange. Suzie Dawson, for example, is hosting the video presentations about the plaform.
To be clear I don't mean to shit on the platform, I'm just approaching it with a lot of cynicism. I want to understand what it is and its problems and merits.
Hmm.. would it be too much to paste some of these up around the local schools?