Before Frederick McKinley Jones turned his mind to the problem, food transportation relied on getting to your destination before the ice in the back of the truck melted. Jones invented the refrigeration system that is now used to keep perishable items cold as they travel around the country. A great tinkerer, problem-solver and self-taught engineer, Jones patented over 60 inventions and was one of the most prolific inventors of the 20th Century. After serving in WWI, Jones worked on a variety of inventions including early designs for a snowmobile, mobile X-ray technology and equipment for the film industry. Frederick Jones was the first person of African descent to receive the National Medal of Technology, awarded posthumously in 1991, thirty years after his death.