Every episode is extensively researched and all of the sources are included in the reference list in the transcripts.
I taught my self sound engineering skills doing a Udemy online course, first for GarageBand and then I upgraded to Logic Pro X.
During lockdown, I started writing parody songs to my Year 11 Modern History class, just to keep things fun. It is way less nerve wracking to perform in front of people when you are not able to see their faces!