Dr. Ellen Stofan is a planetary geologist who has spent a lot of time looking up at the stars and thinking about life outside our planet. But in this episode, she talks with Kim about the portraits of some of her favorite earth dwellers. Among the trailblazers she highlights: a judge who fought for women's rights and a marine biologist who challenged the way we see ourselves in relation to the natural world. See the portraits: Rachel Carson and the Blue Marble Shot The Four Justices Althea Gibson