Many inventions change lives, but Nils Bohlin's invention has probably helped to save more than a million lives so far. Bohlin invented a new type of seat belt that is in all cars made today. Before Bohlin's invention, seat belts were buckled across the stomach (see picture). The buckles often caused injuries during hight-speed accidents. Bohlin's seat belt holds the upper and lower body safely in place, with a buckle at the side.