The most important invention in my life is the hair tie. It makes my life better because when my hair is down or in my face i can just put it up. Also, over the last couple of years instead of using hair ties for your hair.. girls have beenwearing them as bracelets. The person who invented the hair tie is Mary Laswell Smith in the mid 1920's. Hair ties come in many different forms.. there is the extra stretchy ones (i have to use those or it will pop.) the tiny ones.. pink....blue purple all different colors!