A fun way to realize different country extends is this game where need to match moveable country shapes to their location on a mercator map: https://bramus.github.io/mercator-puzzle-redux/
I liked that about v1 as well, but it seems like they have brought it over to v2 [0]. Trying it on a v2 project it only seems to have one commit for everything up until the first clone?
I would recommend to also look at this guideline + tooling to create an automatic changelog based on your commits: https://www.conventionalcommits.org/
There is a project in Germany which monitors particulate matter. They provide a guide how to build a sensor using a SDS011 and a ESP8266: http://luftdaten.info/en/construction-manual/