Today on TWiST, we're joined by Stacy Salvi, Co-Founder & CEO of The90. She spent 8 years building wearables at Fitbit (through Google's $2.1B acquisition) and is now betting on a new stat: UV exposure. Her answer is The90 Gem, a piece of smart jewelry that tracks your real UV exposure and tells you exactly when to reapply. See you at 11 AM central! Live details in comments. Company: https://the90.com/the90-gem LinkedIn: https://linkedin.com/in/stacysalvi/