sqlite is amazing and everything.

I still use Postgresql for most things - the tool support is genuinely a lot better. I also find the explain output much easier to understand.

There are also features which I occasionally use which Postgresql support such as partitioning, functional indexes, partial indexes. These can be emulated in some way with sqlite I'm sure, but they are fairly nice.

I have implemented some really critical stuff in sqlite and it's been amazing though. Anyone using sqlite in production needs to really understand the concurrency limits though.

Isn't this basically how those single-use hand warmers work? Fine iron powder reacts with air/moisture?

Sounds pretty useless given that a) Elemental iron does not occur naturally on earth b) It requires a lot of energy, usually fossil fuels to make it.

Elemental iron does occur naturally in scrapyards, and the process is a cycle.

Maybe they can cut out the middle-man and just burn coke, which does not need to be stored in a sealed container

Which middleman? The suggested method of obtaining pure iron powder involves electrolysis of oxidized iron powder. I don't even see where you could insert coke into this process.

The process for actually making iron, rather than the one they've imagined, involves smelting with coke. I'm pretty sure that electrolysing iron oxide is not a thing that's done on an industrial scale.

There is just one - ATmega4809-PF - which is available in a pin-through-hole 40-pin DIP package.

But I don't really see why to use that, there are loads of breakout boards for the others in the similar series, attiny3217 is good.