Nobel made many inventions throughout his life, and received 255 patents, including 129 for dynamite alone. The most important thing is nitroglycerin explosive. His inventive interests were not limited to explosives. As an inventor and scientist, he had rich imagination and indomitable perseverance. He has previously studied synthetic rubber and rayon, conducted experiments to improve records, telephones, batteries, and electric light components, and also attempted to synthesize gemstones.