Maybe we can keep that between us?

That's an idea... make it public, that faraday cages need to be grounded to work. All the tin foil hat wearers will have to stay at home, and a lot of problems are solved

There is no perfect way to prevent others from abusing your mail address. But you can make their live harder. First of all you can set up a SPF rule on your DNS to informs others, that only your mx server is allowed to send mail from that domain, and what to do with mail from other servers. In addit...

Reminds mit a little of Lothareks Hydra. Where are the differences?

Retro Recipes has some nice ideas on this:

Where can I get one?

If you scroll down the page you'll find a reseller search.

Neat indeed:

https://www.raspberrypi.org/products/raspberry-pi-400/

Whenever I see something like this, I wonder if this could become the next home computer

I recommend watching "The Great Hack" on Netflix. It's a documentary on how Cambridge Analytica manipulated public opinion in a couple of cases, including the Brexit campaign.

Australia is scary

Cool If they now would integrate pick & place you would have a completely automated smt production on your desktop... very impressive.