Tips | HealthTap. As usual, mom was right. I can't remember how many times my mom, a Registered Nurse, told us to wash our hands. I still do it often, and she taught me to do it for twenty seconds each time. There are many ways to do it right; but, meditation is my favorite. As a result, I can't remember the last time I was really sick with a cold or flu. The hands are the biggest transmitter of the cold and flu viruses. So, there is now a second rule. Rule Number One: backup regularly. Rule Number Two: wash your hands for twenty seconds. By the way, this tip brought to you by HealthTap, which you can get for your phone at Google Play Store, or that other store.