Science has confirmed that talking with your hands can make you more persuasive, according to research based on over 1000 TED Talks.
If you use "Illustrator" techniques - demonstrating the size, shape or number of something while discussing it - you will be more persuasive.
"Highlighters" - pointing to something you are talking about - and random gestures, on the other had, had little or no impact.
The full story is here: https://www.popsci.com/health/hand-gestures-persuasive/
