My favourite podcast right now is Let's Learn Everything, three science geeks taking turns to explain things to each other. In a standard episode, there's a deep dive into a science topic, followed by a lighter miscellaneous segment. Special episodes, such as the yearly HaLearnDays or the occasional guest episode, take a different format.
The three all have science degrees, and do proper research for their deep dives. This is a podcast which comes with supporting citations.