Some Raspberry Pi 3B+ or newer running LibreElec or OSMC, both using Kodi. With a dedicated media center case, you can use a remote control or alternatively an Android smartphone with the Kore app. Sharing YouTube videos from the smartphone works as well if the Kodi-YouTube app is installed.

The built in computer is mining bitcoins and the generated heat is used for boiling the water.

must be network connected

No

They check a signature, not a physical passport.

The idea is that they don’t store it at all.

https://discuss.tchncs.de/comment/28098122

It depends on how AV is implemented. Google can either ask for your ID card, that would be inherently non-anonymous and prevent you from creating a burner account, if they would store the information of your id card – which of course Google would never do (/s). The other option would be a third party would check your ID an provide Google only with the information that the request is done by somebody of legal age.

You’re not the only one. Fortunately, somebody has already compiled a list (in German) of tweaks to make Thunderbird more accessible:

https://borumat.de/thunderbird-easy-peasy

A p-value, which measures how surprising the observed data would be if there were truly no effect, of greater than 0.05 does not, they say, show there is ‘no effect’. … Instead, the authors say, a non-significant result simply means there is insufficient evidence to conclude a difference exists, not proof that a difference does not exist.

I get that SM = Social Media, not Scrum Master or Sadomasochism but what is AV short for? Neither Antivirus or Adult Video seem to match your intention. ;-)

Likely Age Verification.

Nothing short of a French medieval device will do.

The “medieval device” you are referring to, back in 1792, was in fact a cutting-edge modern era device.

Because education is a duty of the state. Why the Catholic church runs schools at all is another question.