> there is that CO2 on the air that we actually want to get rid of
For this reason I have long been slightly baffled that development of compostable/biodegradable bio-based plastics is such a priority in materials research. Sure, it's interesting in the very long run, but for the foreseeable future, converting atmospheric CO2 (via plants as an initial step) into a long lived, inert material that can just be buried after an initial use seems like a benefit.
Biodegradable is only one type of degradation. Some of those compounds break down over time, or with exposure to uv or random stuff in the ground, into nasty compounds that you certainly don't want entering the water cycle or food cycle. An additional attribute of biodegradable therefore is: keeps (non CO2 pollution down).
In addition, things that biodegrade don't immediately just turn into CO2. Things like biomass (that is everything alive and dead that isn't decomposed) use a lot of that carbon. A significant fraction of the carbon in rotting stuff doesn't end up in the atmosphere for decades or longer. The carbon cycle isn't just "CO2 becomes plants which become CO2"... there's a lot more steps in between (for example, next time you eat... you are a direct next step!). Some of those steps take a very, very long time.
Yeah food co-ops are awesome but they don't expose that kind of information to the casual shopper. Even most members. Even if you're very actively involved you'd have to strap together multiple spreadsheets and receipts to come up with something like I'm describing
I guess I'm thinking of something like dynamic pricing, except instead of it being used to manipulate consumers into paying the most they can possibly pay, it's used to give you really transparent, real-time information about what goes into that final pricetag
My local co-op is stupid expensive, like $8 for a box of cereal that costs $4 at my normal grocery store, $7 for a dozen eggs, $8 butter, $8/lb chicken thighs.
There are non-coop but organic and "fancy" grocery stores in the area as well that decimate them on prices.
Admittedly, these items are all very high quality, organic, small batch, hand crafted, local, minority-owned, protecting the rainforest etc. type products, but as a single man living alone, my grocery bill would be probably $800 a month if I bought all of my food from them.
There is something to be said for the power of group purchasing power though. For instance, you can buy a cow for much less than the cost of the individual cuts and have it butchered and split for like, $2-$4/lb of meat you receive.
Many of those big bells in other cultures are on fixed mountings (in a carillon, for instance). The idea of mounting the bell on a rotating wheel - which imposes limits on what music can be played due to the rotational inertia of the wheel, therefore leading to a unique style of composition - is distinctively English.
More likely a hall effect sensor, which is solid state and a lot smaller. And yes, older MacBooks had something like that, as evidenced by the fact you could put them to sleep by holding a magnet in the right place (just to the left of the trackpad IIRC in the models I'm familiar with)
Nice one ! Curious since I know almost nothing about HW - do magnets screw with computer HW otherwise ? I would guess no since we don't use HDD anymore but not sure.
As far as I know, even HDDs were pretty resilient to magnets when in their enclosures. I once took a large magnet meant for holding together concrete forms, one strong enough that it stuck to a ferrous surface it could probably support my weight, and stuck it to a hard drive for a full year to see if it'd break. The drive, as well as all of the data on it, were fine.
Non-spill fluid quick disconnects are established tech in industries like medical, chemical processing, beverage dispensing, and hydraulic power, so there are plenty of design concepts to draw on.
