The boom in genetic testing services, which use saliva samples to trace the ancestry and medical traits of customers, has spawned a sudden fascination with DNA diagnostics.

Capitalizing on the same fast-growing science, Microbe Detectives LLC, a 3-year-old Milwaukee startup company, has begun marketing genetic tests that analyze water for microbiological contaminants, which otherwise would go undetected under a microscope or in a petri dish. Read the full story here.