A rat scurrying nearby makes me feel a bit panicked. The feeling isn't mutual though - it turns out mice and rats feel comfortable around me!
Scientists have found that rodents used in research get stressed when they can smell a man. Stress alters how the animals feel pain, so male scientists could accidentally skew the results of medical research.
It's wrong to knowingly stress animals. They're important to research, but I think we should think carefully about who runs these studies in the future.