Civil-rights activists protesting the segregation of African Americans, environmentalists fighting to save the planet and feminists working to secure women's rights all have one goal in common - making our world a better place. Through raucous protests or quiet persistence in the face of injustice, Mahatma Gandhi, Helen Keller, Cesar Chavez, Susan B. Anthony, Martin Luther King Jr. and countless others activists have devoted their lives to the betterment of mankind.