Shameless plug, semi-related game I made some years ago based on Wikipedia links, where the goal is to find the page that’s _not_ linked to the others. https://havarnov.github.io/oddoneout/
I was wondering about the same thing. I think that signal just sends a message to APNS (and Google’s equivalent) that you have something to look at like a new message or whatever. That makes the app wake up and goes to signals servers for the actual content and the app creates the actual notifications on your device.
This reminds me of an art installation at the university in Trondheim, Norway. It's using a glass ball as a lens to burn holes in a tin plate. Every year the tin plate is changed and displayed on the wall inside the university.
Shameless plug: I’ve made a small and stupid game where you’re presented Wikipedia articles and you have to guess which article is not linked to by any of the other articles.
Azure. Microsoft revolves around Azure these days, if they can provide a better dev experience that leads to more people using Azure they're happy to spend money on it.
There's one in Denmark as well, although much smaller (1: 1 billion). One thing that I thought was really cool when I visited was that if you stood by the fake earth an looked at the fake sun it appeared precisely the same size as the real sun. Also very cool to walk for a couple of hours and reaching tiny Pluto.