I did find it interesting that you said "I won't bother quoting the article" and then ended up reading out selected bits for the next thirty minutes. Perhaps the length of the recording was too long? It wasn't for me but others might have thought so?
Well, yeah. Why did you decide to make a close-to-an-hour lecture this time? And you focused on two different topics. It makes a broadcast less efficient in terms of information retention for listeners.