Some of the world's most famous inventions were never meant to exist. One of the best examples is Silly Putty, the stretchy, bouncy toy that entertained generations of children and adults alike.
What began as a serious wartime scientific project during World War II ended up becoming one of the most iconic toys of the 20th century. Instead of solving a major industrial problem, researchers accidentally created a strange substance that could stretch, bounce and even copy newspaper print.
