PCR and rapid tests aren't the only places where evidence of SARS-COV-2, commonly known as COVID-19, shows up. The virus that causes COVID-19 also turns up in a city's wastewater. Because of that, wastewater has become a powerful tool to give scientists early glimpses into when infections are peaking. "Wastewater actually tells us a really great story," said Amanda Wegner, communications and public affairs director at the Madison Metropolitan Sewerage District. "What we've learned with viruses is that people shed the virus. When they use the bathroom, that enters the wastewater stream." According to the Centers for Disease Control and...