User talk:Garrydfuller
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Paradoxical laughter - if you can find good research, this would be interesting, but I'm skeptical that there's research.
knowledge of human nature - this one is too broad
psychagogy - this one could be good, especially if you add more info to how it relates to modern psych
unipolar emotions - this one could be good. One thing you could try is to relate it to how memory works or emotional biases.