Scientists have found an interesting fact. Rats have a sense of fear in the presence of men. In the presence of women as no stress response is not observed.
Researchers from McGill University have conducted a very interesting study. Psychologist Jeffrey Mogil believes that the gender of the laboratory and personnel may significantly affect the results of experiments involving laboratory mice and rats. Therefore, the experiments cannot be considered fully reliable.
Perhaps when the confirmation information male researchers will leave the room with the animals for a few hours before experiments. Of course, not every lab would go for it. Even Jeffrey Mogil believes that no one will do it.