Take the inventor Nils Bohlin who invented the modern-day car seatbelt. His invented has saved millions of lives. Fifty years ago, Bohlin was an engineer who worked for the car manufacturer Volvo.There were other types of seatbelts, but he developed the first one which went across the chest and across the legs and then joined at the same place. Amazingly, this was a very simple idea which no one had tried before – and that’s probably ture of so many great inventions.