Imagine you’re grabbing coffee or chatting at a party, and the person across from you is wearing what looks like totally normal designer frames. But something feels slightly... off. With smart glasses becoming the new "it" accessory,

Here's a question with trillion-dollar consequences for the economy. Are we in an AI bubble or not? Planet Money's Jeff Guo runs us through some of the signs economists are looking for to get an answer. JEFF GUO, BYLINE: If you want to stir up some frothy ...