Research Paper on Bacterial Colonies in Households

Which household surface produces the most amount of bacteria colonies?
My hypothesis is that the entrance doorknob contains the greatest amount of bacteria/bacteria colonies. I have been fascinated with bacteria and microorganisms ever since a health seminar my father once took me to. I hoped to achieve the fact that people in their domicile that bacteria does exist and can be dangerous, and we should be extremely careful of our hygienic state because of the things we touch. One fact that comes to mind are coins. …