Brad Meltzer wrote a kids' biography series, #OrdinaryPeopleChangeTheWorld
and asked who my hero is. I have so many! I'll just focus on one for now.
Temple Grandin was born with autism, which back in the 40s and 50s was just considered brain damaged. With the encouragement of a science teacher who believed in her, she used her distinct insights to revolutionize how we understand animal behavior. Not content to change theory, she applied her ideas to make slaughter houses more humane and convinced the owners to go along with it because it's also cheaper and easier.
Heroes don't accept the world as is. Push new ideas. Sweat to make it happen.