Researchers out of Michigan State discovered only 5% of us know how to properly wash our hands.  They discovered this after watching closet to 4,000 people in public restrooms.  

They define "proper" as washing your hands at least 15 to 20 seconds to kill the germs.

33% didn't use soap and 10% just walked out without washing at all.  Men were the biggest offenders.

***I'm not sure what grosses me out more in this study, though, the 10% that don't wash their hands, or the 12 college students that watched 4,000 people in public bathrooms.