In May 1974, scratch cards went on sale for the first time in the US State of Massachusetts.

Free giveaway and coupon games from stores had been commonplace across the USA during the 1950s and '60s – but players could easily cheat.

The mathematician John Koza was hired to make the games more secure; he succeeded in making the modern-day scratch card. He tells Johnny I’Anson how he convinced the state-run lotteries to use his invention to offer cash prizes.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there. For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more. Recent episodes explore everything from the death of Adolf Hitler, the first spacewalk and the making of the movie Jaws, to celebrity tortoise Lonesome George, the Kobe earthquake and the invention of superglue. We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: Eva Peron – Argentina’s Evita; President Ronald Reagan and his famous ‘tear down this wall’ speech; Thomas Keneally on why he wrote Schindler’s List; and Jacques Derrida, France’s ‘rock star’ philosopher. You can learn all about fascinating and surprising stories, such as the civil rights swimming protest; the disastrous D-Day rehearsal; and the death of one of the world’s oldest languages.

(Photo: The original scratch card. Credit: Massachusetts State Lottery)