A man is a white lab coat with safety glass pouring liquid from one glass to another while a woman looks on .
We doubt that a professor is performing an experiment in front of his students in the laboratory .
We doubt that a professor is performing an experiment in front of his students in the laboratory .
It is highly likely that a professor is performing an experiment in front of his students in the laboratory .
A professor is performing an experiment in front of his students in the laboratory .