Instead of showing off how much you know about a topic, ask a question that lets your companion feel smart.
'Impressing' a girl by demonstrating how smart you are is a poor sexual strategy, especially compared to deepening a connection by leading her to tell you about a topic she has studied.
Example: A girl who studied mental health was telling me about a friend. It seemed to me like friend could be diagnosed with a personality disorder.
Instead of making a statement, I asked 'do you think your friend has something like borderline personality disorder?' even though the description pointed to narcissistic personality disorder.
The girl went on to describe the differences between BPD and NPD and her body language and tone became more passionate.
I helped her connect with me and feel good about herself. Since she had a turn as the teacher, I gave myself space to take a turn as the teacher about a new topic that might come up later. Finally, I gave myself space to say 'well you're the psychology expert' as a tease when we talk about sexual desire.
Men who enjoyed the validation that came from impressing their teachers should try this.
Too many people try to be know-it-alls. Pitch a softball question and let her enjoy taking a swing.