This Working Quadcopter Drone Was Built Using Leonardo da Vinci's 500-Year-Old Sketches
Leonardo da Vinci is best known for works like the Mona Lisa and The Last Supper, but what you might not know is that in the 1480s-hundreds of years before the first flight-the polymath sketched a design for an aircraft. Lacking the right materials, da Vinci never built or tested the helicopter-like device, leaving us...