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There have been all kinds of interpretations for the psychology behind when people lift their voice at the end of a statement. But do you notice, president Kennedy does it as a matter of ingrained habit. Check YouTube if you don’t believe. My estimation is he does it with 80% of his sentences of his public speeches. And a lot in interviews too.
What is JFK doing with all those HRT’s ? I think each time he is just saying, “Question there? Didn’t think so.”