@trending_contents_io on Instagram: "The post features a 23-second video of rural workers rapidly assembling a nail-free, interlocking wooden bridge over a stream using bamboo poles, showcasing Leonardo da Vinci's 1502 self-anchoring design for quick military deployment. Da Vinci's sketch, proposed to the Ottoman Sultan but unbuilt in his era, relies on geometric tension for stability; a 2001 Norwegian full-scale replica confirmed it could span up to 100 meters with basic tools. Posted by AI inf