Hope all is well with you. I enjoyed reading you post this week. I think JFK was a people person. He just had a way with his words and it shows it during this speech as it does in many of his speeches. I also feel as if this has some persuasive elements in it.
I listened to the Shuttle Challenger address last week since it had been a while since I had heard it and I can agree that it was defiantly a very informative speech with subtle persuasive elements with just as you said with the children watching t school.
When it comes to giving an informative speech it really all depends on how the speaker is delivering it. It also, matters on the topic the speaker picks if he or she picks something that they know about for example