First 200 people to use this link https://brilliant.org/WIL/ can get 20% off an annual premium subscription to Brilliant! If you're interested in this topic and how to properly "mew" (practice good oral posture and other habits that encourage good facial development), check out the Orthotropics channel: https://bit.ly/2DciWp0 One thing missing from this discussion is the health impacts of having good oral posture.