Ah. So can you name a contribution Leonardo had that, like Einstein or Newton, is still relevant today? Because he was working from scratch, much of what he did was utterly wrong. His work on anatomy is astonishing, and the drawings beautiful --- but not correct, nor even a particularly good approximation. He also had no global system to spread his results, so what he did well languished, undeveloped (the helicopter, parachute, some choice geological ideas, etc. ) Leonardo was a genius --- but a genius of his ability would do more, of more importance, in more fields, more correctly, and with more far-reaching results, than Leonardo ever could in 1400's Italy.