john: good evening. 'm john yang. geoff bennett is away. tonight on "pbs news weekend," we look at some of the misconceptions about gender affirming care, as some states move to restrict access. th, a thing most people turn up their noses at has become an important tool in tracking the spread of covid. >> wastewater surveillance is just -- it could be like a complete revolution in the way that wtrack infectious disease in communities. john: and, a colorado doctor on his life's work providing abortion services to women. all that and the day's headlines on tonight's "pbs news weekend."