The best way to avoid getting sick and spread germs to other people is to keep your hands clean. You touch your nose, eyes, and mouth dozens of times a day, often without noticing it. And that's how germs usually get inside your body. 

Another sure way to let viruses and bacteria in is to grab some food with unwashed hands before eating it. Germs also tend to stick to handrails, furniture, door handles, and the likes. Washing them with soap and clean, running water is normally more than enough. But what if you've been doing it wrong all this time?  

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