Both those who developped it & those controlling it - simple as that.

No. Next question ?

I'm really wondering about the air filtering needed for this to work. Gas turbines are already quite sensitive to bigger particles in the air but for the fuel cell membranes, this could be a much harder problem.

I bet you could spin the natural gas in a centrifuge to eliminate larger particles.

I would guess the natural gas is quite purified by that point, but for the fuel cell to work you need to combine it with air (or to be precise, the oxygen in the air) and a lot of it. So for the fuel cell membranes not to clog with dust and gunk they will have to clean in in some way to prevent issues, ideally without to much extra-energy use or expense per unit of air filtered.

How about a HEPA or ULPA filter? These are very mature technology, work extremely well, and are not particularly expensive.

Where can I actually download the F-Droid 2.0 APK ? Their page directs me to the old version & the old version does not look like it wants to update itself to 2.0... :P

Many people are partially color blind, with IIRC most people having issues with properly seeing the green color.

Yeah, compared to separate hardware HSMs mobile banking is a massive downgrade in both security as well as user being in control of the hardware they own (by forcing locked down closer source OS & forcing hardware updates).

If mobile banking really wanted to be secure, they would support something like a NFC yubikey for transaction verification. The fact they fully ignore separate secure HSMs tells you what you need to know about their security.

That would be like requiring people taking driving lessons before driving cars - what nonsense! Just let them behind the wheel & they will figure it out just fine!

Rambalac is so nice - I have been watching his videos for many years & even retraced his steps a couple times during actual trips tp Japan.

One interesting channel I started watching recently is called Watatabi: https://m.youtube.com/@watatabi

Its quite different from Rambalac - called Watatabi: https://m.youtube.com/@watatabi

Its a channel about exploring more remote places, like ancient onsen ryokans, scenic places & natural landmarks. Unlike Rambalac there is editing and naration but in this case it kinda fits the different scope & the places visited are super interesting. :)

Rocket Lab has launch pads in New Zealand.

Chinese rockets companies are evolving at insane pace, including RLVs. A couple of big milestones have been achieved this year alone, like first stage landing.

Also Stoke Space, YC startup, is interesting. They could even beat SpaceX to fully reusable if SpaceX find the refuel it and send it up again thing challenging.

They have a different approach - rather than a ceramic heat shield they have a metal shield to be cooled by the liquid H2+O2 fuel. https://youtu.be/3V6lfs7xFJM?t=191