Matthew Hiller started making anti-Elon Musk stickers for Teslas after Musk's X takeover. He's made six figures selling them.

Tesla sales are falling dramatically, and industry analysts say it's largely due to how customers view CEO Elon Musk. NPR speaks with Matt Hiller, who designs anti-Musk stickers for Tesla owners.

What if your body could tell the truth—even when your face couldn’t? A new wearable device may be the future of emotional transparency.