Some call him "a modern day Da Vinci." He has hundreds of inventions. He's the author of 13 books. He is the subject of several documentaries including the award-winning "Future by Design."

At 91, he works harder than anyone you've ever met, has a razor-sharp mind, and is still inventing, writing, and drawing every single day - just about non-stop.

His name is Jacque Fresco.