Have you ever wondered what regular expressions are? Do you have trouble falling asleep? Paul Boag runs the excellent podcast Boagworld (plus a UX and digital transformation consultancy), and opened up the podcast for a season to anyone and everyone. The idea was about 10 minutes of stuff per person, and he and his co-host Marcus would discuss it afterwards.
He was kind enough to accept something from me, about data processing. It was a bit of an outlier in the season – most were about running a business, understanding your customers, designing websites and other things like that (which tend to be what Paul normally covers on his podcast).