Horseradish is so potent that it clears clogged sinuses, tickles taste‐buds when dabbed on gefilte fish or roast beef… and now, it can clean up industrial wastewater. Jean‐Mare Bol‐lag, codirector of Penn State's Center for Bioremediation and Detoxification, and Jerzy Dec, a research associate there, report that minced horseradish root can clean wastewater containing phenols a lot more cheaply than other chemical and physical treatments.