Colin Hanks, David Harbour and Kimiko Glenn celebrate Fred Rogers and his fight for government-funded children's TV. Also: the female journalist who helped take down John D. Rockefeller's oil monopoly.
Abbi Jacobson, Josh Charles, Amber Tamblyn, Jane Krakowski and Jillian Bell salute Margaret Sanger's crusade for accessible birth control. Also: the creation of the Kinsey scale; and Gloria Steinem's undercover work at the Playboy Club.
Questlove, Method Man, Raven-Symone and more celebrate the early history of hip-hop. Also: the man known for inventing Motown, Berry Gordy; and "Star Trek" actress Nichelle Nichols's activism on and off the TV screen.