user134450

hydrofluoric acid

Not sure if serious but just in case: why would there be any HF in a lithium ion battery?

Are the parts both made of PLA? Silicone caulking would be elastic and easy to break but it might also become unstuck on its own since the adhesion to plastics is not great.

Rubber cement would also work in principle but it might not be reversible at all and depending on the solvent and what plastics you used it might damage the plastic parts while the solvent is drying. Acetone can damage ABS plastics for instance.

Would a low-temp hot melt gun work? They can operate as low as 120°C which might be low enough to not destroy the plastic parts.

yeah, but thats not really saying that it isnt cruel.

So 3 years of malnutrition is not cruel?

the country was treated generously for fear of it going to the other side

https://en.wikipedia.org/wiki/Allied_plans_for_German_industry_after_World_War_II#Economic_consequences Quote:

In Germany the shortage of food was an acute problem. […] the average kilocalorie intake per day was estimated to be 1,080, […] millions of people are slowly starving.
Germany received many offers from Western European nations to trade food for desperately needed coal and steel. […]. Denmark offered 150 tons of lard a month; Turkey offered hazelnuts; Norway offered fish and fish oil; Sweden offered considerable amounts of fats. However, the Allies disallowed the Germans to trade.

So "generous" is a bit relative here. Germany was not subject to the most extreme plans for de-industrialisation, which some had planned. But at the same time there was definitely planned hardship, which had no reasonable explanation based on security.

i think for Ariane 6 the marginal cost of a launch is simply still too high to ever get to those numbers. Maybe Ariane 7 will be better in that regard, assuming they manage to make the boosters reusable.

Arme Menschen sind eher kriminell

https://strafrecht-online.org/documents/111390/_4_-_Kriminalisierung_der_Armen_J5lV5bU.pdf

leider eine oft von großen medien verbreitete Fehleinschätzung. Es gibt sicher Zusammenhänge zwischen Armut und Kriminalität aber diese sind eben nicht 1 zu 1 wie du es beschreibst. Es gibt ganz sicher einen kausalen Zusammenhang zwischen der Art der Kriminalität und der sozialen Schicht … zB wird ein Millionär statistisch betrachtet vermutlich weniger Raubüberfälle durchführen um seine Drogenabhängigkeit zu finanzieren als ein mittelloser Obdachloser, dafür aber vermutlich mehr Steuerhinterziehung.

maybe time for CV dazzle: https://arxiv.org/pdf/2412.13507
This is not foolproof (read the paper for details) but it can help to protect peoples identities if used correctly.

It makes a lot more sense once you consider where you are starting from: a rock hurtling around the sun at breakneck speed (29.8 km/s). You can not really bullseye something when you are going almost 30 km per second sideways to it.

https://learn.sparkfun.com/tutorials/logic-levels/all

If i read your question correctly then you are wondering if the voltages you see are going to work for TTL devices. As you can see in the linked tutorial it is not just about nominal Vcc levels. Every chip is different. :)

Eutelsat

OneWeb is owned by Eutelsat and i think that is the one they refer to in the article. OneWeb satelites use 450 km - 1200 km orbits so 3 to 8 ms delay assuming the signal goes straight up and straight down again.

In general waste glass and metals can be recycled easily and effectively and in many cases it is energetically efficient to do so compared to making new glass or metals form natural resources. There are a couple of caveats to this though that might be important:

• Not all kinds of glass can be recycled, the type of glass used for single use containers can be recycled though (soda-lime glass)
• Glass making currently does not work with pure recyclate (broken up reclaimed glass), but 50% recycling material is possible and common
• colour defects in recycled glass are a problem, so make sure you know what colours of glass can be recycled by your local recycling company and how they need it separated. this is especially important for white glass and brown glass. some glass recycling processes don't need colour separation though.
• ferrous metals, aluminium, copper, precious metals and many of their alloys can be recycled effectively and the percentage of products made from recycled metals is going up. for other metals its a bit more tricky: for example titanium is too niche to recycle from a consumer waste stream, lithium is hard to process from a waste stream in general, zinc is usually only recycled as a byproduct when recycling galvanised steel.
• There is also the issue that composite materials may not be fully recyclable. metal plated plastics are typically not recycled. tetra paks are only partially recyclable – the aluminium liner is typically lost because recycling it is not economical right now. the plastic liner in tetra paks is also typically lost – only the paper fibres are recovered.

There is a lot of research into metal recycling going on right now though, so that might change soon. :) Just because the technology exists to recycle something does not mean that somebody is doing it unfortunately. Even if it is economical to recycle something – meaning the recycled material would cost less than the virgin material – it is still possible that it isnt done because the market is too niche. For instance borosilicate glass can be recycled and it would be very energy efficient to do so but the market would be too small for anybody to invest in it. I guess energy is still too cheap.

Plastic liners in general are not typically recycled, if there is no easy method to separate them from the base material. This applies to cans, paper cups, metal bottles, furniture and lots of other things. In most cases they still allow the base material to be recycled though. For instance in ferrous metal recycling (cans) the plastic liners might simple be burned away in the electric arc furnace.