system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it easier to talk when we move hands?

I see it all the time during speeches. I noticed I was doing it the other day and it made my flow of speech better.
gpt
Words are linguistically representative of concepts, but their range of meaning is limited. You can get a lot of information from things like tone and emphasis (the audible equivalent of "reading between the lines"), but body language adds yet another level of interpretation. For people with the subconscious desire to be understood with specificity and precision, making hand motions and facial expressions is a natural extension of the communication process.

Let me make it even simpler: you know when you comment on something in a sarcastic way and someone overreacts in a reply, not realizing that you're not really angry or upset? Imagine how much easier it would be if someone was listening to you speak instead of reading text in their own assumed tone. Hand motions and facial expressions are exactly that, but one level higher. You feel like it's "easier" to talk because you're using even more tools to make your communication clear, and you feel more comfortable and confident that you're being understood. 

And you're right - most of the time, you are being understood better when you use the right words, the right tone, the right emphasis, and the right body language.