Here is an extremely memorable piece of footage where 5-time world champion, Juan Manuel Fangio, aged 66, races against Jack Brabham. The 4 lap 'demonstration' was run after the Australian Grand Prix at Sandown in 1978. With Fangio in his W196 Mercedes Benz and Brabham in his Repco Brabham, a car 12 years newer than Fangio's. An awesome exhibition of great racing cars, pushed to their limit against one another, a special clip. | collectorscarworld.com

In a world fraught with obstacles, who will prevail in a race against time: human or machine? See what happens when we race a drone controlled by artificial intelligence against another guided by a professional human pilot: http://go.nasa.gov/2hSENey | NASA - National Aeronautics and Space Administration