If you are thinking often about how to operate a spacecraft with a large crews, this video might be interesting, its a good discussion about the different watch / shift systems aboard a spacecraft/ship and the differences between them - including the explanation why one watch system does not fit all missions and ship types.
A pretty good introduction into the German side of philosophy and enlightenment and how it shaped the world around us. Of course, there could have been more to mention than just nationalism, the theories of communism also profited a lot from this.
A bit of SPAM (because I'm the one who uploaded the video) but with the intention of sharing my experiences with the Short Wave.
This is what the process of decoding a WEFAX image looks like, which is a type of fax that is transmitted by Short Wave radio. In my case it is a weather map sent by the Chilean Navy Meteorological Service.