When I first felt Dual Lock snap together, it was like popping bubble wrap - this is so satisfying, what IS this sorcery?! Years later, 3M reached out to sponsor my content, and I asked if I could talk about Dual Lock. They were surprised! Because it’s one of their fasteners, not exactly a scientific miracle. (Think “hook-and-loop” strappy fasteners on kids’ shoes, but with no hook, and no loop). Then, I got to chat with 3M fastener engineers. They explained how it works: rounded mushroom-shaped