Probably because many people have touched the materials so if you don't some of the bacteria could get into yourbody.
You must wash your hands after an experiment so you don't contaminate yourself with anything harmful.
Yes, you should always be sterile before performing any experiment as to not add any variables.
As per the safety rules you must wash your hands after experimenting because when handling chemicals or bio-hazardous materials it might left some bacteria in your hands and you can be sick after that or you can get a disease. So always wash your hands with soap even though you wear gloves while experimenting.
Think about literally washing your hands and you can figure this out. If you wash something off your hands, you are getting rid of it. Washing your hands of something means you are done with it - you take no further responsibility or work no further on it.
wash your hands :)
You must make sure that you wash your hands after you finish doing the experiment.
yes
so that you don't get sick off of the germs that you pick up when you touch anything!!! it's very important to wash your hands when you are done doing anything!!
Before so everything stays consistent and after so you're not all germy and stuff. :D
It is supposed to be wash their hands not your hands because that wiuld be weird having someone wash your hands for you.
Wipe dry and then pull up there pants and flush. Wash hands.
Yes. Every state requires food workers to wash their hands. It is done to stop the spreading of diseases like E. Coli.