Brazil's "invisibles" mourn a bicycle advocate

Tree Hugger has posted some photos and a story about the passing of prominent Sao Paulo bicycle activist Marcia Prado, who was struck by a bus on Jan. 14, one of the Sao Paulo cyclists who is killed every four days.

Them call themselves "the invisibles," and though we here have nowhere close to the dangers they face, cyclists in North America can empathize with being the unseen on our roadways.

You can see the post here.