My vacuum is 6 weeks old, and now the rollers underneath aren't moving. Any ideas what might have happened?
gloves - in case both patient and doctor have an openned wound,gloves are used so there will be no contact.you never know if the patinet or even the doctor has a desease which can be transimtted through blood such as HIV.or all kind of skin deaseses which are contagious. mask- you know that when you cough or sneeze you have to cover your mouth with your hand or a handkerchief.doctors wear the mask because in case the patient has a viral problem,the microbes can easily be transmitted through air.
I don't know its name or composition, but physicists use such things all the time in light experiments. They will use something called a partially mirrored surface, which will allow laser light to pass through but reflect some as well.
