Contrary to popular belief, plastic cutting boards are more likely to harbor bacteria than wood ones. New plastic boards are easier to clean, but ones with cuts are nearly impossible to completely disinfect, whereas wood ones absorb and kill bacteria, regardless of age or use.
On average, every dollar bill you touch has over 3,000 different types of bacteria.
There are about 1,400 different species of bacteria in your belly button.
There are about 100,000 bacteria in one litre of drinking water.
Drying your hands with paper towel will reduce the bacterial count by 45 - 60% on your hands. However, using a hand dryer will increase the bacteria on your hands by up to 255% because it blows out bacteria already living in the, conveniently, warm moist environment.
Wearing headphones for an hour increases the bacteria in your ear 700 times.