I'm normally not one for passenger conversation but sat next to the founder of Putter Junky coming back from KC and was one of the most interesting encounters I've had on a flight
Engineer who worked for the PGA for a decade started his own custom club design and manufacturing company. Conversation was mostly around modular putters but he had some cool stories. Talked nearly the entire 2 hours about the golf club design, materials, and manufacturing side. Super interesting
https://putterjunky.com/