Stories 1 - 3 for Odor threshold

There's the familiar odor of agar plates and astringent chemicals. But then I notice, tucked in the corner of the room, is a small robot. ...

... achieving 99.44% H2S removal (<0.05 ppm at outlet) as well as 90% odor removal (<100 dilutions to threshold), performing well above design conditions. ...

This process is much like teaching a narcotics dog to alert on a hidden odor. Normally in the process of teaching an aggressive narcotics alert we do alert ...