From why we get a runny nose to bacteria inside us outnumbering cells, we count 15 facts about our own bodies we never even knew br br 10. Heart Pumping br 09. Sleep in Eyes br 08. Stomach br 07. Runny Nose br 06. Skin br 05. Muscle Soreness br 04. Gaining Weight br 03. Gut Bacteria br 02. Body Heat br 01.