It goes without saying that the desire to accomplish the task with more confidence to avoid wasting time and labour and to spare our experimental animals as much as possible made us strictly observe all the precautions taken by surgeons in respect to their patients.
There was a time when someone would get on a plane and request to move their seat just because the person sitting next to them was of a different ethnicity or religion or nationality. But I don't think my generation wants that. That's how it used to be.