Dorothy Stang was a Catholic nun who rode a motorcycle in the back roads of Brazil, where she helped migrant farmers to work their land in an environmentally sustainable manner. That got her on a death list with a $25,000 reward for her killing, a lot of money in rural Brazil. Three years ago, on a muddy stretch of road in the heart of the jungle, Stan shot six times at close range. She was 73 when she died. Now she's the subject of The Greatest Gift, by Binka Le Breton, director of the Iracambi Rain Forest Research Center in Brazil.