Why Some Ancient Chinese Bridges Were Built With No Nails

Some ancient Chinese bridges were built with no nails because the joinery did the work—locking wood and stone together so the structure could flex, drain, and survive seasons of swelling, shrinking, and earthquakes. Here’s how mortise-and-tenon, dovetails, and interlocking brackets made “nail-free” bridges incredibly strong. #China #Bridges #Engineering #Architecture #History