#7 – Super Glue
Super glue was invented during World War II, in 1942, when a man named Harry Coover Jr. was researching varieties of glue for the purpose of making clear plastic gun sights. He never managed to figure out how to create better gun sights and ended up abandoning the project. However, six year later he got back to the research and noticed that the materials he was experimenting on had incredible adhesive qualities. Due to the fact he was working at Kodak at the time, he got the company to manufacture and sell the first super glue.