and not against it? Take handwashing, for example. We all know that handwashing is the number one way to prevent the spread of disease, and this is really important in hospitals. So, in a hospital here in the United States, a camera was installed to see how often medical staff do, in fact, sanitize their hands before and after entering a patient's room. Now, the medical staff knew a camera was installed. Nevertheless, only one in ten washed their hands before and after entering a patient's room. But then, an intervention was introduced: